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Stockholders' Equity (Narrative) (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Jun. 23, 2017
USD ($)
item
Jan. 31, 2019
shares
Jun. 30, 2017
USD ($)
$ / shares
item
shares
Dec. 31, 2018
USD ($)
item
$ / shares
shares
Dec. 31, 2018
USD ($)
item
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Aug. 31, 2017
USD ($)
Feb. 28, 2013
$ / shares
shares
Oct. 31, 2010
$ / shares
shares
Stockholders' Equity [Line Items]                    
Common Stock, shares authorized | shares       1,000,000,000 1,000,000,000 1,000,000,000       1,000,000,000
Common Stock, par value | $ / shares       $ 0.001 $ 0.001 $ 0.001       $ 0.001
Preferred Stock, shares authorized | shares       50,000,000 50,000,000 50,000,000       50,000,000
Preferred Stock, par value | $ / shares       $ 0.001 $ 0.001 $ 0.001       $ 0.001
Preferred Stock, shares issued | shares       0 0 0        
Preferred Stock, shares outstanding | shares       0 0 0        
Common stock, dividends declared | $ / shares         $ 0          
Voting right of common stock share holders         one          
Voting right of common stock share holdes, number of votes | item         1          
Amount of common stock, preferred stock, depositiry shares, warrants, units or debt securities available in future public offerings               $ 150,000    
Repayment of notes payable           $ 4,500        
Number of shares of common stock called by issuance of warrants | shares             4,200,000   5,500,000  
Aggregate exercise price of common stock called by issuance of warrants | $ / shares                 $ 2.63  
Number of shares of common stock called by issuance of warrants, outstanding | shares       0 0 0        
Number of equity compensation plans | item       3 3          
Accelerated compensation       $ 2,500            
Aggregate intrinsic value outstanding       58,000 $ 58,000          
Aggregate intrinsic value exercisable options       $ 35,900 $ 35,900          
Stock price | $ / shares       $ 7.40 $ 7.40          
Weighted average remaining contractual life for exercisable         5 years 29 days          
Vested and expected to vest, outstanding | shares       22,475,000 22,475,000          
Vested and expected to vest, aggregate intrinsic value       $ 50,200 $ 50,200          
Vested and expected to vest, weighted average exercise price | $ / shares       $ 5.75 $ 5.75          
Vested and expected to vest, weighted average remaining contractual life         5 years 9 months          
Total intrinsic value of options exercised         $ 5,300 $ 1,700 $ 4,700      
Fair value of options vested         3,900 6,400 20,700      
Stock-based compensation cost capitalized in inventory         700 400        
Stock-based compensation         $ 23,153 $ 20,352 $ 19,562      
2010 Plan [Member]                    
Stockholders' Equity [Line Items]                    
Stock option grant, term         10 years          
Stock option grant, vest         4 years          
Stock option grant, vest rate upon first anniversary       25.00% 25.00%          
Stock option grant, vest rate per month thereafter       2.08% 2.08%          
Vesting period         4 years          
2010 Director Plan [Member]                    
Stockholders' Equity [Line Items]                    
Stock option grant, term         10 years          
Stock option grant, vest rate upon first anniversary       33.00% 33.00%          
Stock option grant, vest rate per month thereafter       2.78% 2.78%          
2010 Director Plan [Member] | Minimum [Member]                    
Stockholders' Equity [Line Items]                    
Stock option grant, vest         1 year          
Vesting period         1 year          
2010 Director Plan [Member] | Maximum [Member]                    
Stockholders' Equity [Line Items]                    
Stock option grant, vest         3 years          
Vesting period         3 years          
2010 Plan and 2010 Director Plan [Member]                    
Stockholders' Equity [Line Items]                    
Common stock reserved for issuance | shares       11,300,000 11,300,000          
ESPP [Member]                    
Stockholders' Equity [Line Items]                    
Common stock reserved for issuance | shares       1,952,507 1,952,507          
Percentage of outstanding common stock used to determine annual plan increase         2.00%          
Number of purchase periods | item       4 4          
Purchase period of ESPP         6 months          
Percentage of fair market value at which stock can be purchased         85.00%          
Weighted average fair value at grant date | $ / shares         $ 1.47 $ 2.28 $ 4.21      
Stock-based compensation         $ 6,800 $ 3,100 $ 3,700      
Common stock purchased under plan | shares         1,674,960 1,289,663 1,259,239      
Cash received from option exercises         $ 3,400 $ 5,300 $ 5,200      
At the Market Offering [Member]                    
Stockholders' Equity [Line Items]                    
Aggregate offering price of shares sold           $ 11,865 58,200      
Shares issued | shares           3,200,000        
Average common stock price per share | $ / shares           $ 3.86        
Proceeds from issuance of common stock from equity offerings, net of issuance costs           $ 11,865 58,200      
Commissions, percentage of gross proceeds     3.00%              
At the Market Offering [Member] | Common Stock [Member]                    
Stockholders' Equity [Line Items]                    
Aggregate offering price of shares sold           $ 3 $ 7      
Shares issued | shares           3,171,000 6,526,000      
Underwritten Public Equity Offering [Member]                    
Stockholders' Equity [Line Items]                    
Aggregate offering price of shares sold         $ 97,530 $ 52,530        
Shares issued | shares     17,700,000   30,600,000          
Proceeds from issuance of common stock from equity offerings, net of issuance costs         $ 97,530 52,530        
Commissions, percentage of gross proceeds     4.00%              
Holders may elect to receive net proceeds from financing activities, percentage         25.00%          
Number of offerings | item         2          
Price per share | $ / shares     $ 3.10 $ 3.38 $ 3.38          
Underwritten Public Equity Offering [Member] | Common Stock [Member]                    
Stockholders' Equity [Line Items]                    
Aggregate offering price of shares sold         $ 30 $ 18        
Shares issued | shares         30,610,000 17,732,000        
Stock Options [Member]                    
Stockholders' Equity [Line Items]                    
Weighted average remaining contractual life         2 years          
Weighted average fair value at grant date | $ / shares         $ 1.50 $ 3.08 $ 5.47      
Stock-based compensation         $ 15,500 $ 17,200 $ 15,700      
Unrecognized compensation costs       $ 14,300 14,300          
Cash received from option exercises         $ 6,300 $ 3,600 $ 2,500      
Stock Options [Member] | $1.16 – 16.00 [Member]                    
Stockholders' Equity [Line Items]                    
Common stock reserved for issuance | shares       12,279,000 12,279,000 6,795,000        
Options expired | shares         1,200,000          
Exercise price, lower range | $ / shares         $ 1.16 $ 1.16        
Exercise price, upper range | $ / shares         16.00 $ 16.00        
Options expired, weighted average exercise price | $ / shares         $ 7.15          
Time-Based Restricted Stock Units (RSUs) [Member] | 2010 Plan [Member]                    
Stockholders' Equity [Line Items]                    
Stock option grant, vest         4 years          
Vesting period         4 years          
Stock-based compensation         $ 193          
Performance-Based Restricted Stock Units (RSUs) [Member] | 2010 Plan [Member]                    
Stockholders' Equity [Line Items]                    
Stock-based compensation         $ 614          
Subsequent Event [Member] | 2010 Plan [Member]                    
Stockholders' Equity [Line Items]                    
Additional common stock reserved for issuance | shares   7,500,000                
Subsequent Event [Member] | ESPP [Member]                    
Stockholders' Equity [Line Items]                    
Additional common stock reserved for issuance | shares   3,000,000                
Notes [Member]                    
Stockholders' Equity [Line Items]                    
Repayment of notes payable $ 4,500   $ 4,500     $ 4,500        
Number of Notes holders paid | item 1   1              
Share-based Compensation Award, Tranche One, Two, Three and Four [Member] | Time-Based Restricted Stock Units (RSUs) [Member] | 2010 Plan [Member]                    
Stockholders' Equity [Line Items]                    
Vesting percentage         25.00%