Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 32,900	$ 34,596
Marketable securities	336	8,319
Accounts receivable, net of allowance for doubtful accounts of $2,786 and $2,852 as of September 30, 2018 and December 31, 2017, respectively	28,971	28,316
Inventories	24,676	22,732
Current contract assets	3,460	0
Prepaid expenses and other current assets	3,741	3,816
Total current assets	94,084	97,779
Property and equipment, less accumulated depreciation of $55,736 and $51,099 as of September 30, 2018 and December 31, 2017, respectively	52,375	43,521
Intangible assets, less accumulated amortization of $23,757 and $20,656 as of September 30, 2018 and December 31, 2017, respectively	11,637	15,120
Goodwill	32,848	33,872
Other non-current assets	6,701	5,927
Non-current contract assets	6,626	0
Non-current deferred income tax asset	201	20
Total assets	204,472	196,239
Current liabilities:
Accounts payable	14,957	15,736
Accrued compensation and employee-related expenses	5,598	5,358
Accrued other	11,748	9,210
Accrued product warranty costs	2,032	2,074
Deferred revenue	0	6,919
Current portion of long-term debt	22,691	2,482
Contract liabilities	10,770	0
Liability for uncertain tax positions	1,316	1,570
Total current liabilities	69,112	43,349
Other long-term liabilities	2,060	19
Long-term contract liabilities	8,771	0
Non-current deferred income tax liability	2,547	2,634
Long-term debt, excluding current portion	20,252	44,572
Total liabilities	102,742	90,574
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; 19,021,853 and 18,787,816 shares issued at September 30, 2018 and December 31, 2017, respectively; and 17,739,431 and 17,128,825 shares outstanding at September 30, 2018 and December 31, 2017, respectively	190	188
Additional paid-in capital	138,731	134,361
Accumulated deficit	(13,575)	(4,417)
Accumulated other comprehensive loss	(13,452)	(11,317)
Stockholders Equity Before Treasury Stock Adjustment	111,894	118,815
Less: treasury stock at cost, common stock, 1,282,422 and 1,658,991 shares as of September 30, 2018 and December 31, 2017, respectively	(10,164)	(13,150)
Total stockholders’ equity	101,730	105,665
Total liabilities and stockholders’ equity	$ 204,472	$ 196,239