Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Summary of Common Stock Shares Activity (Detail)

v3.22.2.2
Stockholders' Equity - Summary of Common Stock Shares Activity (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Common Stock Outstanding Roll Forward [Roll Forward]        
Beginning balance $ 38,927 $ 25,924 $ 41,258 $ 22,758
Beginning balance (in shares)     28,705,334  
Net (loss) income (13,345) 1,658 $ (18,796) (3,018)
Stock-based compensation expense 1,100 542 2,022 940
Common stock issued through employee stock purchase plan     10 9
Common stock issued, net of expenses 18,798 3,415 20,915 3,412
Common stock issued for vested restricted stock units 0 15 0 0
Vested Loan Agreement warrants   766 71 766
Ending balance $ 45,480 32,320 $ 45,480 32,320
Ending balance (in shares) 32,596,403   32,596,403  
April 2020 Notes        
Common Stock Outstanding Roll Forward [Roll Forward]        
Common stock issued for conversion of Notes       7,453
Common Stock        
Common Stock Outstanding Roll Forward [Roll Forward]        
Beginning balance $ 32 $ 21 $ 32 $ 20
Beginning balance (in shares) 29,221,158 20,625,637 28,705,334 19,663,698
Net (loss) income $ 0 $ 0 $ 0 $ 0
Stock-based compensation expense 0 0 0 0
Common stock issued through employee stock purchase plan     $ 0 $ 0
Common stock issued through employee stock purchase (in shares)     3,120 2,184
Common stock issued, net of expenses $ 4 $ 5 $ 4 $ 5
Common stock issued, net of expenses (in shares) 3,358,333 2,516,802 3,845,943 2,516,802
Common stock issued for vested restricted stock units $ 0 $ 0 $ 0 $ 0
Common stock issued for vested restricted stock units (in shares) 16,912 5,113 42,006 5,788
Vested Loan Agreement warrants   $ 0 $ 0 $ 0
Ending balance $ 36 $ 26 $ 36 $ 26
Ending balance (in shares) 32,596,403 23,147,552 32,596,403 23,147,552
Common Stock | April 2020 Notes        
Common Stock Outstanding Roll Forward [Roll Forward]        
Common stock issued for conversion of Notes       $ 1
Common stock issued for conversion of Notes (in shares)       959,080
Additional Paid-in Capital        
Common Stock Outstanding Roll Forward [Roll Forward]        
Beginning balance $ 403,825 $ 357,192 $ 400,705 $ 349,351
Net (loss) income 0 0 0 0
Stock-based compensation expense 1,100 542 2,022 940
Common stock issued through employee stock purchase plan     10 9
Common stock issued, net of expenses 18,794 3,410 20,911 3,407
Common stock issued for vested restricted stock units 0 15 0 0
Vested Loan Agreement warrants   766 71 766
Ending balance 423,719 361,925 423,719 361,925
Additional Paid-in Capital | April 2020 Notes        
Common Stock Outstanding Roll Forward [Roll Forward]        
Common stock issued for conversion of Notes       7,452
Accumulated Deficit        
Common Stock Outstanding Roll Forward [Roll Forward]        
Beginning balance (364,930) (331,289) (359,479) (326,613)
Net (loss) income (13,345) 1,658 (18,796) (3,018)
Stock-based compensation expense 0 0 0 0
Common stock issued through employee stock purchase plan     0 0
Common stock issued, net of expenses 0 0 0 0
Common stock issued for vested restricted stock units 0 0 0 0
Vested Loan Agreement warrants   0 0 0
Ending balance $ (378,275) $ (329,631) $ (378,275) (329,631)
Accumulated Deficit | April 2020 Notes        
Common Stock Outstanding Roll Forward [Roll Forward]        
Common stock issued for conversion of Notes       $ 0