Property and Equipment - Additional Information (Detail) - USD ($) |
3 Months Ended | |
---|---|---|
Mar. 31, 2017 |
Mar. 31, 2016 |
|
Property Plant And Equipment [Line Items] | ||
Depreciation and amortization expense | $ 200,000 | $ 15,000 |
Minimum | ||
Property Plant And Equipment [Line Items] | ||
Property, plant and equipment, useful life | 3 years | |
Maximum | ||
Property Plant And Equipment [Line Items] | ||
Property, plant and equipment, useful life | 5 years |