Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 12,578	$ 18,365
Marketable securities	25,141	29,907
Accounts receivable, net of allowance for doubtful accounts of $1,596 and $1,589 as of December 31, 2020 & December 31, 2019, respectively	33,687	32,891
Inventories	24,674	23,465
Prepaid expenses and other current assets	3,894	3,188
Current contract assets	1,086	1,458
Total current assets	101,060	109,274
Property and equipment, net	56,273	53,584
Intangible assets, net	2,254	4,943
Goodwill	6,592	15,408
Right of use assets	6,893	6,286
Other non-current assets	7,785	6,443
Non-current contract assets	2,661	3,408
Deferred income tax asset	73	45
Total assets	183,591	199,391
Current liabilities:
Accounts payable	11,400	15,031
Accrued compensation and employee-related expenses	7,156	5,637
Accrued other	6,597	7,733
Accrued product warranty costs	1,812	2,194
Current portion of long-term debt	4,992	0
Contract liabilities	4,445	4,443
Less current installments of obligation under current-operating lease liabilities	3,826	2,831
Liability for uncertain tax positions	560	521
Total current liabilities	40,788	38,390
Other long-term liabilities	674	1,292
Obligations under long-term operating lease liabilities, excluding current installments	3,204	3,482
Long-term contract liabilities	4,688	5,476
Long-term debt, excluding current portion	1,935	0
Deferred income tax liability	418	762
Total liabilities	51,707	49,402
Commitments and contingencies (Notes 1, 5, 6, 15, 16 and 17)
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, 19,862,534 and 19,398,699 shares issued at December 31, 2020 and December 31, 2019, respectively; and 18,429,840 and 18,001,261 shares outstanding at December 31, 2020 and December 31, 2019, respectively	199	194
Additional paid-in capital	149,170	144,485
Accumulated (deficit) retained earnings	(2,402)	19,538
Accumulated other comprehensive loss	(3,232)	(2,767)
Total Stockholders equity before treasury stock adjustment	143,735	161,450
Less: treasury stock at cost, 1,432,694 and 1,397,438 shares as of December 31, 2020 and December 31, 2019, respectively	(11,851)	(11,461)
Total stockholders’ equity	131,884	149,989
Total liabilities and stockholders’ equity	$ 183,591	$ 199,391