Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Unrecognized Stock-based Compensation Cost and Estimated Weighted Average Amortization Period (Details)

v3.19.1
Stock-Based Compensation - Unrecognized Stock-based Compensation Cost and Estimated Weighted Average Amortization Period (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]  
Unrecognized compensation cost $ 12,245
Employee options  
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]  
Unrecognized compensation cost $ 12,243
Weighted average remaining amortization period (years) 2 years 10 months 24 days
Nonemployee options  
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]  
Unrecognized costs of unvested options awarded $ 2
Weighted average remaining amortization period (years) 2 months 12 days