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Fair Value of Financial Instruments (Detail) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Financial liabilities:
Financial liabilities fair value	$ 118,800	$ 102,000
Carrying Value
Financial liabilities:
Financial liabilities fair value	111,400	111,400
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3
Financial liabilities:
Financial liabilities fair value	118,800	102,000
2021 Notes
Financial liabilities:
Financial liabilities fair value	19,600	17,500
2021 Notes | Carrying Value
Financial liabilities:
Financial liabilities fair value	19,100	19,100
2021 Notes | Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3
Financial liabilities:
Financial liabilities fair value	19,600	17,500
Facility Financing Obligation
Financial liabilities:
Financial liabilities fair value	11,400	11,400
Facility Financing Obligation | Carrying Value
Financial liabilities:
Financial liabilities fair value	11,400	11,300
Facility Financing Obligation | Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3
Financial liabilities:
Financial liabilities fair value	11,400	11,400
Note Payable to Related Party
Financial liabilities:
Financial liabilities fair value	69,400	55,000
Note Payable to Related Party | Carrying Value
Financial liabilities:
Financial liabilities fair value	72,000	72,100
Note Payable to Related Party | Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3
Financial liabilities:
Financial liabilities fair value	69,400	55,000
Milestone Rights Liability
Financial liabilities:
Financial liabilities fair value	18,400	18,100
Milestone Rights Liability | Carrying Value
Financial liabilities:
Financial liabilities fair value	8,900	8,900
Milestone Rights Liability | Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3
Financial liabilities:
Financial liabilities fair value	$ 18,400	$ 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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