Annual report pursuant to Section 13 and 15(d)

Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details)

v3.19.1
Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]    
Accrued expenses $ 0 $ 182
Stock-based compensation 0 1,309
Other 0 49
Current deferred tax assets 0 1,540
Accrued expenses 132 0
Stock-based compensation 1,911 0
Other (31) 0
Net operating loss carryforwards 44,730 40,504
Research and development credits 3,226 3,230
Noncurrent deferred tax assets (liabilities) 49,968 43,734
Total deferred tax assets 49,968 45,274
Valuation allowances (49,968) (45,274)
Net deferred tax assets $ 0 $ 0