Income Taxes - Significant Components of the Company's Deferred Tax Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred Tax Assets, Net [Abstract]
Amortization and depreciation	$ 45,555	$ 38,376
Net operating loss carryforwards	40,896	31,621
Tax credits	10,136	8,200
Stock-based compensation	4,853	3,763
Lease obligation	984	0
Other	940	888
Gross deferred tax assets	103,364	82,848
Valuation allowance	(102,344)	(81,645)
Deferred tax assets net of valuation allowance	1,020	1,203
Deferred Tax Liabilities, Net [Abstract]
Right of use asset	(834)	0
Revenue recognition	(158)	(1,054)
Other	(28)	(149)
Net deferred tax assets	$ 0	$ 0