Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Deferred Tax Assets, Net, Noncurrent	$ 24	$ 24
Current assets:
Cash and cash equivalents	29,385	26,422
Marketable securities	16,743	25,712
Accounts receivable, net of allowance for doubtful accounts of $2,967 and $3,477 as of March 31, 2017 and December 31, 2016, respectively	26,962	31,152
Inventories	21,755	20,745
Prepaid expenses and other current assets	4,953	4,801
Total current assets	99,798	108,832
Property and equipment, less accumulated depreciation of $38,937 as of June 30, 2014 and $36,456 as of December 31, 2013	37,159	36,586
Intangible assets, less accumulated amortization of $2,934 as of June 30, 2014 and $2,005 as of December 31, 2013	17,034	17,838
Goodwill	31,603	31,343
Other non-current assets	5,410	5,134
Total assets	191,028	199,757
Current liabilities:
Accounts payable	10,342	8,436
Accrued compensation and employee-related expenses	5,516	4,766
Accrued other	8,380	8,317
Accrued product warranty costs	2,395	2,280
Deferred revenue	7,156	6,661
Current portion of long-term debt	2,475	7,900
Liability for Uncertain Tax Positions, Current	1,293	1,283
Total current liabilities	37,557	39,643
Deferred income taxes	3,139	3,133
Long-term debt, excluding current portion	41	326
Non-current deferred income tax liability	46,435	50,153
Total liabilities	87,172	93,255
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; 17,099,149 and 16,936,128 shares issued at June 30, 2014 and December 31, 2013; and 15,440,158 and 15,277,137 shares outstanding at June 30, 2014 and December 31, 2013, respectively	187	184
Additional paid-in capital	131,268	129,660
Retained earnings	1,732	6,617
Accumulated other comprehensive loss	(16,181)	(16,809)
Stockholders Equity Before Treasury Stock Adjustment	117,006	119,652
Less: treasury stock at cost, common stock, 1,658,991 shares as of March 31, 2017 and December 31, 2016	(13,150)	(13,150)
Total stockholders’ equity	103,856	106,502
Total liabilities and stockholders’ equity	$ 191,028	$ 199,757