Restatement of Previously Issued Financial Statements - Schedule of Condensed Consolidated Statement of Stockholders' Equity, Including Balances Originally Reported, Corrections and as Restated Balances (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Accumulated deficit	$ (130,372)	$ (113,836)
Total stockholders' equity	186,760	$ 203,690
As Previously Reported
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Accumulated deficit	(118,832)
Total stockholders' equity	198,300
Correction
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Accumulated deficit	(11,540)
Total stockholders' equity	$ (11,540)