CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 41,245	$ 56,818
Restricted cash	2,013	2,416
Accounts receivable, net of allowances	57,410	77,046
Inventories	17,817	19,922
Prepaid expenses	7,137	5,464
Contract assets	25,542	18,903
Other current assets	1,896	1,953
Total current assets	153,060	182,522
Property and equipment, net	17,742	16,028
Goodwill	32,643	32,643
Right of use assets	23,242	24,143
Deferred tax assets, net	4,155	5,210
Other long-term assets	14,265	13,454
Total assets	245,107	274,000
Current liabilities:
Accounts payable	21,380	26,854
Accrued compensation and benefits	26,821	35,458
Accrued expenses and other current liabilities	36,457	37,552
Income taxes payable	145	868
Less: current portion	8,709	9,158
Deferred revenues	80,744	87,475
Total current liabilities	174,256	197,365
Long-term debt	160,889	160,806
Long-term deferred revenues	11,578	10,607
Long-term lease liabilities	22,673	23,379
Other long-term liabilities	5,730	5,917
Total liabilities	375,126	398,074
Commitments and contingencies (Note 7)
Stockholders' deficit:
Common stock, par value $0.01; authorized: 100,000 shares; issued: 46,219 shares at March 31, 2022 and 45,828 shares at December 31, 2021; outstanding: 44,991 shares at March 31, 2022 and 44,954 shares at December 31, 2021	459	455
Treasury stock	(35,906)	(25,090)
Additional paid-in capital	1,026,115	1,031,633
Accumulated deficit	(1,116,373)	(1,126,959)
Accumulated other comprehensive loss	(4,314)	(4,113)
Total stockholders' deficit	(130,019)	(124,074)
Total liabilities and stockholders' deficit	$ 245,107	$ 274,000