Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Investments, Owned, Federal Income Tax Note [Line Items]
Valuation allowance	$ 72,199,000	$ 52,286,000
Investment tax credits and research and development credits scheduled to expire	2017
Liability for uncertain tax positions	$ 2,600,000
Amount of unrecognized or expected tax benefits recorded in financial statement	1,141,000	1,141,000
Penalties related to income taxes	$ 0	0
Unrecognized potential tax benefits		1,000,000
Number of period for which income tax is exempted	5 years
Decreased foreign taxes		$ 147,000
Benefit of tax holiday on net income per share (diluted)		$ 0.01
Current Income Tax Provision	$ 331,000	$ 13,000
Cumulative undistributed earnings of foreign subsidiaries	0
Increase (Decrease) in Foreign Withholding Taxes Payable	274,000
Federal [Member]
Investments, Owned, Federal Income Tax Note [Line Items]
Net operating loss carryforward	$ 148,100,000
Operating loss carry forwards expiration year	2021
Tax credit carry forward amount	$ 668,000
Deferred tax asset	21,700,000
State and Local Jurisdiction [Member]
Investments, Owned, Federal Income Tax Note [Line Items]
Net operating loss carryforward	$ 179,600,000
Operating loss carry forwards expiration year	2019
Deferred tax asset	$ 26,400,000
Research [Member]
Investments, Owned, Federal Income Tax Note [Line Items]
Tax credit carry forward amount	68,600
Investment Credit [Member]
Investments, Owned, Federal Income Tax Note [Line Items]
Tax credit carry forward amount	$ 174,000
Malaysia [Member]
Investments, Owned, Federal Income Tax Note [Line Items]
Number of period for which income tax is exempted	5 years
Tax holiday additional renewal period	5 years
Current Income Tax Provision	$ 42,000