Restructuring and Other Costs - Summary (Details) $ in Thousands			3 Months Ended	12 Months Ended
	Nov. 06, 2019	Jul. 31, 2017 position	Dec. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2017 USD ($)
Restructuring and other costs
Restructuring and other costs				$ 2,506
Research and Development Expense
Restructuring and other costs
Restructuring and other costs				690
Selling and Marketing Expense
Restructuring and other costs
Restructuring and other costs				1,399
General and Administrative Expense
Restructuring and other costs
Restructuring and other costs				$ 417
Ankerud Transition Agreement
Restructuring and other costs
Severance expense					$ 386
Fortune Transition Agreement
Restructuring and other costs
Severance expense					417
Elimination of portion of Company's workforce
Positions eliminated
Restructuring And Related Activities, Decrease In Head Count, Percentage	22.00%
Number of positions eliminated | position		30
Restructuring and other costs
Restructuring and other costs			$ 554		$ 1,703