Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 58,022	$ 66,392
Available-for-sale securities	57,096	159,943
Accounts receivable, net	23,625	12,187
Inventories	21,603	17,712
Prepaid expenses and other current assets	7,744	7,178
Total current assets	168,090	263,412
Property and equipment, net	381	542
Intangible and other non-current assets	137,918	1,014
Total assets	306,389	264,968
Current liabilities:
Accounts payable	4,483	10,072
Accrued and other liabilities	31,924	21,475
Deferred revenue	2,159	2,075
Current portion of long-term debt		5,147
Total current liabilities	38,566	38,769
Long-term debt, net of current portion	300,182	230,536
Deferred revenue, net of current portion	3,686	4,674
Non-current accrued and other liabilities	258	327
Total liabilities	342,692	274,306
Commitments and contingencies
Stockholders' deficit
Preferred stock; $1.00 par value; 5,000 shares authorized; no shares issued and outstanding at September 30, 2018 and December 31, 2017	0	0
Common stock; $.001 par value; 200,000 shares authorized; 10,628 and 10,603 shares issued and outstanding at September 30, 2018 and December 31, 2017, respectively	11	11
Additional paid-in capital	840,100	834,824
Accumulated other comprehensive loss	(399)	(608)
Accumulated deficit	(876,015)	(843,565)
Total stockholders' deficit	(36,303)	(9,338)
Total liabilities and stockholders' deficit	$ 306,389	$ 264,968