CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 84,546 $ 18,695
Accounts receivable, net 15,064 13,078
Inventories 15,312 12,515
Prepaid expenses and other current assets 1,773 1,871
Total current assets 116,695 46,159
Property and equipment, net 3,943 2,666
Intangible assets, net 928 926
Other assets 1,120 887
Total assets 122,686 50,638
Current liabilities:    
Accounts payable 13,314 14,435
Accrued liabilities 6,821 6,571
Deferred revenue 644 542
Current portion of notes payable 1,138 1,321
Total current liabilities 21,917 22,869
Notes payable 1,828 1,838
Warrant liability   601
Other long-term liabilities 467 1,620
Total liabilities 24,212 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 December 31, 2013, respectively; aggregate liquidation preference of $118,150 and $0 at December 31, 2012 and December 31, 2013, 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 December 31, 2013, respectively      
Common stock, $0.0001 par value; 127,836,592 and 500,000,000 shares authorized; 2,490,870 and 22,785,104 shares issued and outstanding at December 31, 2012 and December 31, 2013, respectively 2  
Additional paid-in capital 200,545 12,988
Accumulated deficit (102,084) (105,587)
Accumulated other comprehensive income (loss) 11 (4)
Total stockholders' equity (deficit) 98,474 (92,603)
Total liabilities, redeemable convertible preferred stock and stockholders' equity (deficit) $ 122,686 $ 50,638