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Other Long-Term Obligations and Commitments - Summary of Future Minimum Lease Payments for Non-Cancelable Operating Leases (Detail) $ in Thousands	Jun. 30, 2019 USD ($)
Commitments and Contingencies Disclosure [Abstract]
2019	$ 299
2020	155
2021	17
Total undiscounted lease payments	471
Less: Amount associated with discounting	(19)
Net operating lease liabilities	452
2019	5
2020	7
2021	2
Total undiscounted lease payments	14
Less: Amount associated with discounting	(1)
Net operating lease liabilities	$ 13

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