Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Deferred Tax Assets, Net, Noncurrent	$ 3,794	$ 4,686
Current assets:
Cash and cash equivalents	24,786	22,719
Marketable securities	22,659	22,619
Accounts receivable, net of allowance for doubtful accounts of $3,908 and $3,534 as of June 30, 2016 and December 31, 2015, respectively	32,588	43,895
Inventories	21,700	21,589
Prepaid expenses and other assets	5,595	4,271
Total current assets	107,328	115,093
Property and equipment, less accumulated depreciation of $46,924 and $43,202 as of June 30, 2016 and December 31, 2015, respectively	38,125	39,900
Intangible assets, less accumulated amortization of $13,923 and $11,390 as of June 30, 2016 and December 31, 2015, respectively	21,879	26,755
Goodwill	33,645	36,747
Other non-current assets	4,401	3,096
Total assets	209,172	226,277
Current liabilities:
Accounts payable	9,500	8,975
Accrued compensation and employee-related expenses	5,398	6,588
Accrued other	8,319	13,516
Accrued product warranty costs	2,227	1,880
Deferred revenue	6,408	5,962
Current portion of long-term debt	7,472	6,638
Total current liabilities	39,324	43,559
Deferred income taxes	4,297	5,097
Long-term debt, excluding current portion	1,200	1,391
Non-current deferred income tax liability	54,109	58,054
Total liabilities	98,930	108,101
Stockholders’ equity:
Preferred stock, $0.01 par value. Authorized 1,000,000 shares; none issued	0	0
Common stock, $0.01 par value. Authorized 30,000,000 shares; 17,487,727 and 17,336,314 shares issued at June 30, 2016 and December 31, 2015, respectively; and 15,828,736 and 15,677,323 shares outstanding at June 30, 2016 and December 31, 2015, respectively	175	173
Additional paid-in capital	125,439	124,619
Retained earnings	10,537	14,134
Accumulated other comprehensive loss	(12,759)	(7,600)
Stockholders Equity Before Treasury Stock Adjustment	123,392	131,326
Less: treasury stock at cost, common stock, 1,658,991 shares as of June 30, 2016 and December 31, 2015	(13,150)	(13,150)
Total stockholders’ equity	110,242	118,176
Total liabilities and stockholders’ equity	$ 209,172	$ 226,277