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Income Taxes - Foreign Currency Exchange Rate Fluctuations, Changes in Net Operating Losses and Credit Carryforwards (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Valuation allowance  
Net increase in valuation allowance $ 2,206
Valuation allowance (as a percent) 100.00%
Deferred Tax Liability Not Recognized, Undistributed Earnings of Foreign Subsidiaries [Abstract]  
Provision for U.S. federal and state taxes on cumulative foreign earnings $ 0
Foreign earnings intended to be reinvested outside of the U.S. $ 0
State  
Operating Loss Carryforwards [Line Items]  
Valuation allowance (as a percent) 100.00%
Research and development tax credit carryforwards $ 778
Foreign  
Operating Loss Carryforwards [Line Items]  
Operating Loss Carryforwards $ 10,791
Valuation allowance (as a percent) 100.00%
Federal  
Operating Loss Carryforwards [Line Items]  
Operating Loss Carryforwards $ 9,156
Research and development tax credit carryforwards $ 340