Segment Information - Summary of Assets by Geographic Region (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 53,013	$ 119,242
United States [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	47,171	88,916
Malaysia [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	5,811	30,276
Other [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 31	$ 50