Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 35,045	$ 29,117
Short-term investments	24,385	65,855
Accounts receivable (net of allowances of $502 and $103 at December 31, 2016 and 2015, respectively)	14,610	25,457
Inventories	20,114	17,924
Prepaid expenses and other current assets	2,517	5,742
Total current assets	96,671	144,095
Long-term investments	0	6,493
Property and equipment, net	16,525	15,258
Other non-current assets	9,291	9,096
Developed technology, net	79,800	91,000
Goodwill	104,108	104,108
Total assets	306,395	370,050
Current liabilities:
Accounts payable	3,967	6,094
Accrued compensation and related benefits	3,996	3,553
Other accrued liabilities	12,374	11,015
Deferred revenue, current	9,163	9,419
Total current liabilities	29,500	30,081
Convertible notes, net	194,951	194,673
Deferred tax liability	21,140	23,595
Deferred revenue, non-current	4,315	4,398
Other non-current liabilities	3,256	2,402
Total liabilities	253,162	255,149
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $0.001 par value, 10,000 shares authorized, no shares issued and outstanding at either December 31, 2016 or 2015	0	0
Common stock: $0.001 par value, 200,000 shares authorized at December 31, 2016 and 2015; 29,208 and 28,844 shares issued and outstanding at December 31, 2016 and 2015, respectively	29	29
Additional paid-in capital	493,441	479,508
Accumulated other comprehensive loss	(760)	(1,144)
Accumulated deficit	(439,477)	(363,492)
Total stockholders’ equity	53,233	114,901
Total liabilities and stockholders’ equity	$ 306,395	$ 370,050