Financial Statement Details - Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Royalties	$ 1,646	$ 1,415
Payroll and related expenses	3,572	2,716
Professional fees	280	483
Accrued interest	713	1,543
Deferred revenue	2,317	2,235
Operating lease liabilities	1,121	1,101
Acquisition-related liabilities	1,000	1,000
Other	6,969	7,368
Total accrued expenses and other current liabilities	$ 17,618	$ 17,861