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Fair Value of Financial Instruments (Detail) - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Financial liabilities:
Financial liabilities fair value	$ 105,000	$ 102,000
Facility Financing Obligation
Financial liabilities:
Financial liabilities fair value	9,000	11,400
Senior Convertible Notes
Financial liabilities:
Financial liabilities fair value	18,000	17,500
Related Party Notes
Financial liabilities:
Financial liabilities fair value	59,500	55,000
Milestone Rights Liability
Financial liabilities:
Financial liabilities fair value	18,500	18,100
Carrying Value
Financial liabilities:
Financial liabilities fair value	108,900	111,400
Carrying Value | Facility Financing Obligation
Financial liabilities:
Financial liabilities fair value	9,000	11,300
Carrying Value | Senior Convertible Notes
Financial liabilities:
Financial liabilities fair value	19,000	19,100
Carrying Value | Related Party Notes
Financial liabilities:
Financial liabilities fair value	72,000	72,100
Carrying Value | Milestone Rights Liability
Financial liabilities:
Financial liabilities fair value	8,900	8,900
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3
Financial liabilities:
Financial liabilities fair value	105,000	102,000
Estimate of Fair Value Measurement | Facility Financing Obligation | Fair Value, Inputs, Level 3
Financial liabilities:
Financial liabilities fair value	9,000	11,400
Estimate of Fair Value Measurement | Senior Convertible Notes | Fair Value, Inputs, Level 3
Financial liabilities:
Financial liabilities fair value	18,000	17,500
Estimate of Fair Value Measurement | Related Party Notes | Fair Value, Inputs, Level 3
Financial liabilities:
Financial liabilities fair value	59,500	55,000
Estimate of Fair Value Measurement | Milestone Rights Liability | Fair Value, Inputs, Level 3
Financial liabilities:
Financial liabilities fair value	$ 18,500	$ 18,100

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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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