Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 18,542	$ 18,365
Marketable securities	22,487	29,907
Accounts receivable, net of allowance for doubtful accounts of $1,722 and $1,589 as of March 31, 2020 and December 31, 2019, respectively	28,968	32,891
Inventories, net	25,555	23,465
Prepaid expenses and other current assets	3,422	3,188
Current contract assets	1,424	1,458
Total current assets	100,398	109,274
Property and equipment, net	54,756	53,584
Intangible assets, net	4,432	4,943
Goodwill	14,730	15,408
Right of use asset operating lease	5,026	6,286
Other non-current assets	6,644	6,443
Non-current contract assets	3,259	3,408
Non-current deferred income tax asset	40	45
Total assets	189,285	199,391
Current liabilities:
Accounts payable	13,818	15,031
Accrued compensation and employee-related expenses	5,129	5,637
Accrued other	8,551	7,733
Accrued product warranty costs	2,212	2,194
Contract liabilities	4,933	4,443
Current operating lease liability	1,634	2,831
Liability for uncertain tax positions	532	521
Total current liabilities	36,809	38,390
Other long-term liabilities	1,138	1,292
Long-term operating lease liability	3,422	3,482
Long-term contract liabilities	5,221	5,476
Non-current deferred income tax liability	818	762
Total liabilities	47,408	49,402
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; 19,419,121 and 19,398,699 shares issued at March 31, 2020 and December 31, 2019, respectively; and 17,986,427 and 18,001,261 shares outstanding at March 31, 2020 and December 31, 2019, respectively	194	194
Additional paid-in capital	145,457	144,485
Retained earnings	13,324	19,538
Accumulated other comprehensive loss	(5,247)	(2,767)
Stockholders equity before treasury stock adjustment	153,728	161,450
Less: treasury stock at cost, common stock, 1,432,694 and 1,397,438 shares as of March 31, 2020 and December 31, 2019, respectively	(11,851)	(11,461)
Total stockholders’ equity	141,877	149,989
Total liabilities and stockholders’ equity	$ 189,285	$ 199,391