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Goodwill and Intangible Assets - Schedule of Acquired Intangible Assets by Major Asset Class (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items] |  |
Gross | $ 1,353 | $ 1,353
Accumulated amortization | (455) | (197)
Net book value before impairment | 898 | 1,156
Impairment charge | (411) | (411)
Net book value | $ 487 | 745
Minimum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful life | 2 years |
Maximum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful life | 6 years |
Purchased Technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross | $ 265 | 265
Accumulated amortization | (78) | (32)
Net book value before impairment | 187 | 233
Net book value | $ 187 | 233
Purchased Technology [Member] | Minimum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful life | 5 years |
Purchased Technology [Member] | Maximum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful life | 6 years |
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross | $ 999 | 999
Accumulated amortization | (324) | (147)
Net book value before impairment | 675 | 852
Impairment charge | (411) | (411)
Net book value | $ 264 | 441
Customer Relationships [Member] | Minimum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful life | 3 years |
Customer Relationships [Member] | Maximum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful life | 6 years |
Trademarks/Trade Names [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful life | 2 years |
Gross | $ 38 | 38
Accumulated amortization | (28) | (9)
Net book value before impairment | 10 | 29
Net book value | $ 10 | 29
Non-Compete [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful life | 3 years |
Gross | $ 51 | 51
Accumulated amortization | (25) | (9)
Net book value before impairment | 26 | 42
Net book value | $ 26 | $ 42

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