CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 55,662	$ 69,085
Restricted cash	1,663	1,663
Accounts receivable, net of allowances	52,909	73,773
Inventories	29,650	29,166
Prepaid expenses	9,658	9,425
Contract assets	18,246	19,494
Other current assets	5,588	6,125
Total current assets	173,376	208,731
Property and equipment, net	18,421	19,580
Goodwill	32,643	32,643
Right of use assets	28,876	29,747
Long-term deferred tax assets, net	7,078	7,479
Other long-term assets	4,974	6,113
Total assets	265,368	304,293
Current liabilities:
Accounts payable	17,853	39,888
Accrued compensation and benefits	22,347	19,524
Accrued expenses and other current liabilities	29,240	36,759
Income taxes payable	1,990	1,945
Short-term debt	3,385	30,554
Deferred revenues	74,193	83,589
Total current liabilities	149,008	212,259
Long-term debt	227,392	199,034
Long-term deferred revenues	11,530	14,312
Long-term lease liabilities	28,482	28,127
Other long-term liabilities	5,448	5,646
Total liabilities	421,860	459,378
Commitments and Contingencies (Note 8)
Stockholders' deficit:
Common stock	437	430
Additional paid-in capital	1,030,303	1,027,824
Accumulated deficit	(1,183,421)	(1,179,409)
Accumulated other comprehensive loss	(3,811)	(3,930)
Total stockholders' deficit	(156,492)	(155,085)
Total liabilities and stockholders' deficit	$ 265,368	$ 304,293