Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Net operating losses	$ 34,875	$ 21,059
Tax credits	8,648	5,945
Deferred revenue	1,291	4,179
Equity compensation	1,668	3,923
Lease liabilities	13,066	0
Accrued vacation	409	1,170
Deferred rent	0	373
Bad debt	164	164
Depreciation	0	151
Other	260	548
Gross deferred tax assets	60,381	37,512
Less: Valuation allowance	(35,607)	(30,039)
Total deferred tax assets	24,774	7,473
Deferred tax liabilities:
Prepaid expenses	(9,562)	(6,640)
Right-of-use assets	(6,488)	0
Unbilled receivables	(3,849)	(419)
Depreciation	(4,377)	0
Other	(42)	(130)
Total deferred tax liabilities	(24,318)	(7,189)
Net deferred tax asset	$ 456	$ 284