CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 82,485 $ 18,695
Accounts receivable, net 15,941 13,078
Inventories 15,559 12,515
Prepaid expenses and other current assets 1,965 1,871
Total current assets 115,950 46,159
Property and equipment, net 3,640 2,666
Intangible assets, net 970 926
Other assets 1,130 887
Total assets 121,690 50,638
Current liabilities:    
Accounts payable 16,699 14,435
Accrued liabilities 5,548 6,571
Deferred revenue 637 542
Current portion of notes payable 1,191 1,321
Total current liabilities 24,075 22,869
Notes payable 2,127 1,838
Warrant liability   601
Other long-term liabilities 484 1,620
Total liabilities 26,686 26,928
Commitments and contingencies      
Redeemable convertible preferred stock, $0.0001 par value; 83,163,408 and no shares authorized; 15,293,960 and no shares issued and outstanding at December 31, 2012 and September 30, 2013 (unaudited), respectively; aggregate liquidation preference of $118,150 and $0 at December 31, 2012 and September 30, 2013 (unaudited), respectively   116,313
Stockholders' equity (deficit):    
Preferred stock, $0.0001 par value, no and 25,000,000 shares authorized; no shares issued and outstanding at December 31, 2012 and September 30, 2013 (unaudited), respectively      
Common stock, $0.0001 par value; 127,836,592 and 500,000,000 shares authorized; 2,490,870 and 22,766,644 shares issued and outstanding at December 31, 2012 and September 30, 2013 (unaudited), respectively 2  
Additional paid-in capital 199,354 12,988
Accumulated deficit (104,354) (105,587)
Accumulated other comprehensive income (loss) 2 (4)
Total stockholders' equity (deficit) 95,004 (92,603)
Total liabilities, redeemable convertible preferred stock and stockholders' equity (deficit) $ 121,690 $ 50,638