Summary of Significant Accounting Policies - Summary of Fair Value, Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Assets
Total Assets Fair Value	$ 26,581	$ 71,252
Liabilities
Total Liabilities Fair Value	18,291	22,819
Contingent Consideration [Member]
Liabilities
Total Liabilities Fair Value	7,500	13,900
Common and Preferred Stock Warrant Liability [Member]
Liabilities
Total Liabilities Fair Value	10,791	8,919
money Market Securities [Member]
Assets
Cash and cash equivalents, fair value disclosure	21,544	8,901
Corporate Debt Securities [Member]
Assets
Marketable securities		28,224
Asset-backed Securities [Member]
Assets
Marketable securities		17,121
US Treasury Securities [Member]
Assets
Marketable securities	5,037	5,032
Commercial Paper [Member]
Assets
Marketable securities		11,974
Fair Value, Inputs, Level 1 [Member]
Assets
Marketable securities	21,544
Total Assets Fair Value		8,901
Fair Value, Inputs, Level 1 [Member] | money Market Securities [Member]
Assets
Cash and cash equivalents, fair value disclosure	21,544	8,901
Fair Value, Inputs, Level 2 [Member]
Assets
Marketable securities	5,037
Total Assets Fair Value		62,351
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member]
Assets
Marketable securities		28,224
Fair Value, Inputs, Level 2 [Member] | Asset-backed Securities [Member]
Assets
Marketable securities		17,121
Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member]
Assets
Marketable securities	5,037	5,032
Fair Value, Inputs, Level 2 [Member] | Commercial Paper [Member]
Assets
Marketable securities		11,974
Fair Value, Inputs, Level 3 [Member]
Liabilities
Total Liabilities Fair Value	18,291	22,819
Fair Value, Inputs, Level 3 [Member] | Contingent Consideration [Member]
Liabilities
Total Liabilities Fair Value	7,500	13,900
Fair Value, Inputs, Level 3 [Member] | Common and Preferred Stock Warrant Liability [Member]
Liabilities
Total Liabilities Fair Value	$ 10,791	$ 8,919