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Notes Payable - Future Maturities of the CRG Obligation (Detail) - CRG [Member] - Line of Credit [Member]
$ in Thousands
Jun. 30, 2019
USD ($)
Debt Instrument [Line Items]  
2019 $ 0
2020 0
2021 0
2022 13,846
2023 18,461
2024 18,462
2025 9,231
Total maturities 60,000
Unamortized discount and loan costs (1,552)
Total notes payable obligation $ 58,448