Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 9,243	$ 15,212
Marketable securities	46,325	25
Accounts receivable, net of allowance for doubtful accounts of $2,090 and $2,390 as of September 30, 2019 and December 31, 2018, respectively	29,979	28,592
Inventories	25,317	22,942
Prepaid expenses and other current assets	3,121	2,532
Current contract assets	1,407	3,566
Current assets held for sale	0	4,871
Total current assets	115,392	77,740
Property and equipment, net	52,661	50,633
Intangible assets, net	4,840	5,661
Goodwill	14,667	15,031
Right of use assets	6,951	0
Other non-current assets	6,091	5,484
Non-current contract assets	3,449	6,971
Non-current deferred income tax asset	131	226
Non-current assets held for sale	0	25,906
Total assets	204,182	187,652
Current liabilities:
Accounts payable	14,502	16,735
Accrued compensation and employee-related expenses	5,391	4,947
Accrued other	9,501	9,602
Accrued product warranty costs	2,288	1,916
Current portion of long-term debt	0	9,928
Contract liabilities	5,701	7,647
Current operating lease liability	3,584	0
Liability for uncertain tax positions	686	631
Current liabilities held for sale	0	4,604
Total current liabilities	41,653	56,010
Other long-term liabilities	1,445	1,920
Long-term operating lease liability	3,388	0
Long-term contract liabilities	5,194	9,070
Long-term debt, excluding current portion	0	19,437
Non-current deferred income tax liability	835	887
Non-current liabilities held for sale	0	813
Total liabilities	52,515	88,137
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; 19,381,008 and 19,026,393 shares issued at September 30, 2019 and December 31, 2018, respectively; and 18,098,586 and 17,743,971 shares outstanding at September 30, 2019 and December 31, 2018, respectively	194	190
Additional paid-in capital	143,214	139,617
Retained earnings (accumulated deficit)	23,021	(15,397)
Accumulated other comprehensive loss	(4,598)	(14,731)
Stockholders equity before treasury stock adjustment	161,831	109,679
Less: treasury stock at cost, common stock, 1,282,422 shares as of September 30, 2019 and December 31, 2018	(10,164)	(10,164)
Total stockholders’ equity	151,667	99,515
Total liabilities and stockholders’ equity	$ 204,182	$ 187,652