Income Taxes - Summary of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
United States federal tax statutory rate, Amount	$ (33,038)	$ (13,682)
State taxes (net of deferred benefit), Amount	(4,778)	(1,080)
Non-deductible expenses, Amount	709	(1,320)
Change in fair market value	(2,342)	(256)
Warrant remeasurement	(551)	3,630
Research & development credits	(743)	(803)
Change in unrecognized tax benefits, Amount	149	161
Foreign tax rate differential, Amount	2,590	(96)
Goodwill impairment	(6,638)	0
Change in enacted tax rates	(253)	252
Change in valuation allowance, Amount	41,771	9,817
Total income tax benefit	$ (3,124)	$ (3,377)
United States federal tax	21.00%	21.00%
State taxes (net of deferred benefit)	3.00%	1.70%
Non-deductible expenses	(0.50%)	2.00%
Change in fair market value	1.50%	0.40%
Warrant remeasurement and financing costs	0.40%	(5.60%)
Research & development credits	0.50%	1.20%
Change in unrecognized tax benefits	(0.10%)	(0.20%)
Foreign tax rate differential	(1.60%)	0.10%
Goodwill impairment	4.20%	0.00%
Change in enacted tax rates and other	0.20%	(0.30%)
Change in valuation allowance	(26.60%)	(15.10%)
Provision for income taxes	2.00%	5.20%