Summary of Significant Accounting Policies - Impact of Adopting Topic 842 on Condensed Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Assets [Abstract]
Operating lease right-of-use assets	$ 7,774	$ 8,641
Liabilities and stockholders’ equity:
Other accrued liabilities		1,482	$ 1,845
Current portion of operating lease liabilities	1,322	1,058
Operating lease liabilities, net of current portion	$ 10,752	11,776
Deferred rent and lease incentive obligation			3,830
Total		14,316	$ 5,675
Topic 842
Assets [Abstract]
Operating lease right-of-use assets		8,641
Liabilities and stockholders’ equity:
Other accrued liabilities		(363)
Current portion of operating lease liabilities		1,058
Operating lease liabilities, net of current portion		11,776
Deferred rent and lease incentive obligation		(3,830)
Total		$ 8,641