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Other Long-Term Obligations and Commitments - Summary of Future Minimum Lease Payments for Non-Cancelable Operating Leases (Detail) $ in Thousands	Sep. 30, 2019 USD ($)
Commitments and Contingencies Disclosure [Abstract]
2019	$ 149
2020	155
2021	17
Total undiscounted lease payments	321
Less: Amount associated with discounting	(16)
Net operating lease liabilities	305
2019	2
2020	8
2021	2
Total undiscounted lease payments	12
Less: Amount associated with discounting	(1)
Net operating lease liabilities	$ 11

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