CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 55,624	$ 79,899
Restricted cash	1,422	1,422
Accounts receivable, net of allowances	58,831	78,614
Inventories	27,616	26,568
Prepaid expenses	7,308	6,044
Contract assets	21,955	18,579
Other current assets	2,274	2,366
Total current assets	175,030	213,492
Property and equipment, net	15,931	16,814
Goodwill	32,643	32,643
Right of use assets	27,538	29,430
Deferred tax assets, net	6,299	6,801
Other long-term assets	5,544	5,958
Total assets	262,985	305,138
Current liabilities:
Accounts payable	19,220	21,823
Accrued compensation and benefits	25,675	29,105
Accrued expenses and other current liabilities	35,088	42,264
Income taxes payable	1,405	1,664
Short-term debt	9,156	4,941
Deferred revenues	86,172	87,974
Total current liabilities	176,716	187,771
Long-term debt	175,125	202,759
Long-term deferred revenues	11,334	11,284
Long-term lease liabilities	26,913	28,462
Other long-term liabilities	7,471	7,786
Total liabilities	397,559	438,062
Commitments and Contingencies (Note 8)
Stockholders' deficit:
Common stock	448	442
Additional paid-in capital	1,032,068	1,036,658
Accumulated deficit	(1,163,956)	(1,168,347)
Accumulated other comprehensive loss	(3,134)	(1,677)
Total stockholders' deficit	(134,574)	(132,924)
Total liabilities and stockholders' deficit	$ 262,985	$ 305,138