Commitments and Contingencies - Additional Information (Detail)	1 Months Ended		12 Months Ended
	Mar. 31, 2015 USD ($)	Feb. 28, 2015	Dec. 31, 2016 USD ($) ft²	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Apr. 29, 2014 USD ($)
Commitment And Contingencies [Line Items]
Area of corporate headquarters and manufacturing facility | ft²			57,000
Extended lease term	Apr. 30, 2020
Provisions for tenant improvement allowance, maximum	$ 398,000
Capital lease agreement term for information technology equipment		30 months
Future minimum lease payments under capital lease, borrowing rate			1.60%
Future minimum lease payments under capital lease including net minimum lease payment for year ended December 31, 2017			$ 159,000
Accrued capital lease obligations, current position			159,000	$ 167,000
Capital lease obligation, long-term			0	159,000
Rent expense			1,000,000	1,000,000	$ 1,000,000
Purchase commitments pending			18,000,000
Litigation Settlement Amount Receivable Non-Current			825,000
Receivable For Legal Settlements On First Anniversary			275,000
Receivable For Legal Settlements On Second Anniversary			275,000
Receivable For Legal Settlements On Third Anniversary			275,000
Litigation Settlement Amount Receivable Current			550,000
Litigation Settlement Receivable			1,400,000
Litigation Expense Recovered				731,000
Settlement Expense For Dismissal of Patent Infringement Lawsuit Recovered			68,000
Legal settlement at present value			1,200,000
Deferred revenue			$ 3,033,000	3,297,000
Foregoing litigation settlement, description			As part of the settlement, Fotona agreed to pay the Company a total of $1.4 million, with $550,000 payable within 10 days of March 24, 2015 and the remaining, $825,000 payable in three increments of $275,000 each to be paid no later than the first, second, and third anniversary of the effective date of the agreement.
Licensing Agreements United States
Commitment And Contingencies [Line Items]
License period			3 years
Licensing Agreements Outside of United States
Commitment And Contingencies [Line Items]
License period			5 years
Settled Litigation
Commitment And Contingencies [Line Items]
Deferred revenue						$ 379,000
Employee Arrangements and Other Compensation
Commitment And Contingencies [Line Items]
Change in control, if occurs, may require severance benefits payable			$ 1,300,000	1,600,000
Accrued for performance bonuses			$ 67,000	$ 248,000