Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 86.1	$ 71.8
Short-term marketable securities, available-for-sale	29.1	11.8
Accounts receivable, net	74.1	42.4
Inventory	35.2	16.0
Prepaid and other current assets	6.8	3.9
Total current assets	231.3	145.9
Property and equipment, net	54.7	31.2
Restricted cash	0.0	1.0
Intangible assets, net	2.2	2.7
Goodwill	3.7	3.2
Other assets	0.1	0.6
Total assets	292.0	184.6
Current liabilities:
Accounts payable and accrued liabilities	38.9	20.4
Accrued payroll and related expenses	24.9	17.2
Secured Debt, Current	2.3	2.3
Current portion of deferred revenue	0.8	0.7
Total current liabilities	66.9	40.6
Other liabilities	3.9	1.5
Secured Long-term Debt, Noncurrent	0.0	2.3
Total liabilities	$ 70.8	$ 44.4
Commitments and contingencies (Note 4)
Stockholders' equity:
Preferred stock, $0.001 par value, 5.0 shares authorized; no shares issued and outstanding at December 31, 2015 and December 31, 2014, respectively	$ 0.0	$ 0.0
Common stock, $0.001 par value, 100.0 authorized; 82.0 and 81.7 issued and outstanding, respectively, at December 31, 2015; and 77.6 and 77.3 shares issued and outstanding, respectively, at December 31, 2014	0.1	0.1
Additional paid-in capital	776.8	638.0
Accumulated other comprehensive loss	(0.3)	(0.1)
Accumulated deficit	(555.4)	(497.8)
Total stockholders' equity	221.2	140.2
Total liabilities and stockholders' equity	$ 292.0	$ 184.6