CONSOLIDATED BALANCE SHEETS - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 35,247,000	$ 56,818,000
Restricted cash	2,413,000	2,416,000
Accounts receivable, net of allowances of $601 and $1,456 at December 31, 2022 and 2021, respectively	76,849,000	77,046,000
Inventories	20,981,000	19,922,000
Prepaid expenses	8,360,000	5,464,000
Contract assets	32,295,000	18,903,000
Other current assets	2,826,000	1,953,000
Total current assets	178,971,000	182,522,000
Property and equipment, net	23,684,000	16,028,000
Goodwill	32,643,000	32,643,000
Deferred tax assets, net	15,859,000	5,210,000
Other long-term assets	14,901,000	13,454,000
Total assets	287,453,000	274,000,000
Current liabilities:
Accounts payable	45,904,000	26,854,000
Accrued compensation and benefits	22,602,000	35,458,000
Accrued expenses and other current liabilities	36,031,000	37,552,000
Income taxes payable	62,000	868,000
Short-term debt	9,710,000	9,158,000
Deferred revenues	76,308,000	87,475,000
Total current liabilities	190,617,000	197,365,000
Long-term debt	172,958,000	160,806,000
Long-term deferred revenues	17,842,000	10,607,000
Operating Lease, Liability, Noncurrent	20,470,000	23,379,000
Operating Lease, Right-of-Use Asset	21,395,000	24,143,000
Other long-term liabilities	4,348,000	5,917,000
Total liabilities	406,235,000	398,074,000
Commitments and contingencies (Note J)
Stockholders' deficit:
Preferred stock, $0.01 par value, 1,000 shares authorized; no shares issued or outstanding	0	0
Common stock, $0.01 par value, 100,000 shares authorized; 42,339 shares issued and 41,949 shares and 41,356 shares outstanding at December 31, 2018 and 2017, respectively	462,000	455,000
Additional paid-in capital	1,036,287,000	1,031,633,000
Accumulated deficit	(1,071,718,000)	(1,126,959,000)
Treasury stock at cost, net of reissuances, 391 and 983 shares at December 31, 2018 and 2017, respectively	(77,933,000)	(25,090,000)
Accumulated other comprehensive loss	(5,880,000)	(4,113,000)
Total stockholders' deficit	(118,782,000)	(124,074,000)
Total liabilities and stockholders' deficit	$ 287,453,000	$ 274,000,000