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Fair Value of Financial Instruments - Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Financial liabilities:
Financial liabilities fair value	$ 165,800	$ 110,600
MidCap Credit Facility
Financial liabilities:
Financial liabilities fair value	55,400	40,000
Senior convertible notes
Financial liabilities:
Financial liabilities fair value	7,000
PPP Loan
Financial liabilities:
Financial liabilities fair value	4,700
Mann Group Promissory Notes
Financial liabilities:
Financial liabilities fair value	78,900	46,200
Milestone Rights Liability
Financial liabilities:
Financial liabilities fair value	19,800	16,400
2024 Convertible Notes
Financial liabilities:
Financial liabilities fair value		3,700
June 2020 Note
Financial liabilities:
Financial liabilities fair value		2,300
December 2020 Note
Financial liabilities:
Financial liabilities fair value		2,000
Carrying Value
Financial liabilities:
Financial liabilities fair value	129,500	126,200
Carrying Value | MidCap Credit Facility
Financial liabilities:
Financial liabilities fair value	49,300	38,900
Carrying Value | Senior convertible notes
Financial liabilities:
Financial liabilities fair value	5,000
Carrying Value | PPP Loan
Financial liabilities:
Financial liabilities fair value	4,900
Carrying Value | Mann Group Promissory Notes
Financial liabilities:
Financial liabilities fair value	63,000	70,000
Carrying Value | Milestone Rights Liability
Financial liabilities:
Financial liabilities fair value	7,300	7,300
Carrying Value | 2024 Convertible Notes
Financial liabilities:
Financial liabilities fair value		5,000
Carrying Value | June 2020 Note
Financial liabilities:
Financial liabilities fair value		2,500
Carrying Value | December 2020 Note
Financial liabilities:
Financial liabilities fair value		2,500
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3
Financial liabilities:
Financial liabilities fair value	165,800	110,600
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | MidCap Credit Facility
Financial liabilities:
Financial liabilities fair value	55,400	40,000
Estimate of Fair Value Measurement | Senior convertible notes | Fair Value, Inputs, Level 3
Financial liabilities:
Financial liabilities fair value	7,000
Estimate of Fair Value Measurement | PPP Loan | Fair Value, Inputs, Level 3
Financial liabilities:
Financial liabilities fair value	4,700
Estimate of Fair Value Measurement | Mann Group Promissory Notes | Fair Value, Inputs, Level 3
Financial liabilities:
Financial liabilities fair value	78,900	46,200
Estimate of Fair Value Measurement | Milestone Rights Liability | Fair Value, Inputs, Level 3
Financial liabilities:
Financial liabilities fair value	$ 19,800	16,400
Estimate of Fair Value Measurement | 2024 Convertible Notes | Fair Value, Inputs, Level 3
Financial liabilities:
Financial liabilities fair value		3,700
Estimate of Fair Value Measurement | June 2020 Note | Fair Value, Inputs, Level 3
Financial liabilities:
Financial liabilities fair value		2,300
Estimate of Fair Value Measurement | December 2020 Note | Fair Value, Inputs, Level 3
Financial liabilities:
Financial liabilities fair value		$ 2,000

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- Definition

Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities.

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