Annual report pursuant to Section 13 and 15(d)

Equity Incentive Plans - Schedule of Stock-Based Compensation Expense Recorded in Consolidated Statements of Operations (Details)

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Equity Incentive Plans - Schedule of Stock-Based Compensation Expense Recorded in Consolidated Statements of Operations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]      
Stock-based compensation expense $ 2,468 $ 628 $ 83
Costs      
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]      
Stock-based compensation expense 316 75 11
Sale and Marketing      
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]      
Stock-based compensation expense 770 133 7
Research and Development      
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]      
Stock-based compensation expense 272 69 18
General and Administrative      
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]      
Stock-based compensation expense $ 1,110 $ 351 $ 47