Stock-Based Compensation Plans - Additional Information (Detail)			12 Months Ended
	Mar. 10, 2015 $ / shares shares	Jan. 31, 2012 USD ($) Employee $ / shares shares	Dec. 31, 2015 USD ($) shares	Dec. 31, 2014 USD ($) shares	Dec. 31, 2013 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining available shares for issuance under the plan			6,141,970
Stock Option Awards expiry range			5 years
Vest in designated installments over			4 years
Stock Option Awards to purchase shares of the company's common stock | Employee		2
Stock Option Awards granted			0	0
Exercise price / Closing market price per share of common stock | $ / shares		$ 1.45
Stock Option Awards expiration date			Jan. 31, 2017
Compensation expense related to Stock Option | $		$ 522,000
Compensation expense related to Stock Option amortized | $		521,000
Remaining Compensation expense amortized in January 2016 | $		$ 1,000
Fair value of Stock Option Awards with expected volatility		73.00%
Risk-free interest rate		0.71%
Dividend yield rate		0.00%
Expected term		5 years
Value of options granted per share | $ / shares		$ 0.63
Risk-free interest rate, duration		5 years
Weighted average remaining contractual life of options outstanding			1 year 4 months 24 days
Exercisable/vested			1 year 4 months 24 days
Compensation expense to purchase shares under the ESPP | $			$ 144,000	$ 185,000	$ 243,000
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of authorize payroll deductions			15.00%
Maximum Amount of outstanding stock to be subscribed | $			$ 25,000
Company reserved shares of common stock for issuance under the ESPP			400,000
Employees purchase shares			37,000	31,000	35,000
Compensation expense to purchase shares under the ESPP | $			$ 12,000	$ 11,000	$ 7,000
Shares remain available for issuance under the ESPP			50,565
Executive Officer One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Option Awards granted		750,000
Vesting percent of shares		40.00%
Remainder vesting in equal installments		3 years
Executive Officer Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Option Awards granted		75,000
Vesting percent of shares		20.00%
Remainder vesting in equal installments		4 years
Employee Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Option Awards expiry range			10 years
Vest in designated installments over			5 years
Restricted stock | Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price / Closing market price per share of common stock | $ / shares	$ 2.44
Compensation awarded restricted stock units	141,000