Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets:
Net operating loss carryforwards	$ 36,149	$ 38,540
Research & development and AMT credit carryforwards	5,115	5,314
Stock option grants	7,483	7,410
Allowance for doubtful accounts	4,473	4,532
Deferred revenue	964	947
Other, net	1,576	571
Total deferred tax assets	55,760	57,314
Less valuation allowance	(49,759)	(52,998)
Net deferred tax assets	6,001	4,316
Deferred tax liabilities:
Property, plant and equipment	(3,027)	(360)
Identified intangible assets	(2,798)	(3,756)
Indefinite lived intangible assets	(1,233)	(987)
Prepaid insurance	(176)	(200)
Total deferred tax liabilities	(7,234)	(5,303)
Net deferred tax liability	$ (1,233)	$ (987)
Reconciliation between expected income taxes computed at the federal rate and the provision (benefit) for income taxes
Federal rate of income tax (as a percent)	35.00%	35.00%	35.00%
Income tax provision (benefit) at statutory rate	$ 2,763	$ (4,237)	$ (2,486)
State income tax, net of federal benefit	(239)	4	716
Stock-based compensation	133	43	203
Research and development	634	(626)	(488)
Other	416	368	670
(Decrease) increase in valuation allowance	(3,239)	2,135	1,600
Total provision for (benefit from) income taxes	$ 468	(2,313)	215
Net Operating Loss Carryforwards
Minimum percentage of increase in ownership of stockholders for ownership change	50.00%
Period over which a minimum 50 percent of increase in ownership is required for ownership change	3 years
Period of recognition of built-in gains in assets held at the time of ownership change	5 years
Current:
Federal	$ 173
State	50	186
Total provision for income taxes	223	186
Deferred:
Federal	220	(2,355)
State	25	(144)
Total deferred provision for (benefit from) income taxes	245	(2,499)	53
Total provision for (benefit from) income taxes	468	(2,313)	$ 215
Tax reserve recorded for tax contingencies	0	$ 0
Federal
Net Operating Loss Carryforwards
Net operating loss carryforwards	93,364
State
Net Operating Loss Carryforwards
Net operating loss carryforwards	60,491
Research and Development
Net Operating Loss Carryforwards
Tax credit carryforward	$ 5,115