XML 58 R47.htm IDEA: XBRL DOCUMENT v3.5.0.2
Stockholders' Equity (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Feb. 02, 2016
Jul. 23, 2014
Mar. 13, 2014
Dec. 10, 2012
Jun. 30, 2010
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]                    
Common stock, shares authorized 100,000,000   100,000,000   100,000,000          
Common stock, shares issued (in shares) 57,772,165   57,772,165   57,374,907          
Common stock, shares outstanding (in shares) 54,584,170   54,584,170   54,484,760          
Common stock, par value (in dollars per share) $ 0.001   $ 0.001   $ 0.001          
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]                    
Preferred stock, shares authorized 5,000,000   5,000,000   5,000,000          
Preferred stock, shares issued (in shares) 0   0   0          
Preferred stock, shares outstanding (in shares) 0   0   0          
Preferred stock, par value (in dollars per share) $ 0.001   $ 0.001   $ 0.001          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Shares repurchased (in shares) 837,773   837,773              
Per share weighed average fair value of stock options granted during the period (in dollars per share) $ 3.03 $ 4.20 $ 3.00 $ 4.54            
Dividend yield 0.00% 0.00% 0.00% 0.00%            
Expected life 5 years 5 years 5 years 5 years            
Period used to determine volatility     5 years              
Stock option term     10 years              
Total value of stock options exercised     $ 100,000              
Incentive Stock Option [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Unrecognized compensation cost related to nonvested share-based compensation arrangements $ 9,600,000   $ 9,600,000              
Weighted average recognition period of unrecognized compensation cost     1 year 8 months 27 days              
Restricted Stock Units (RSUs) [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Unrecognized compensation cost related to nonvested share-based compensation arrangements $ 8,100,000   $ 8,100,000              
Weighted average recognition period of unrecognized compensation cost     3 years 12 days              
Vesting period         4 years          
1998 Plan [Member] | Incentive Stock Option [Member] | Maximum [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Shares of common stock available for issuance 5,850,000   5,850,000              
2000 Plan [Member] | Incentive Stock Option [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Increase in number of shares of common stock available for issuance     4,150,000              
1998 and 2000 Plan [Member] | Incentive Stock Option [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Shares of common stock available for issuance 10,000,000   10,000,000              
2009 Plan [Member] | Incentive Stock Option [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Shares of common stock available for issuance 2,409,000   2,409,000              
Increase in number of shares of common stock available for issuance     6,000,000              
2010 Employee Stock Purchase Plan [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Shares of common stock available for issuance 284,000   284,000             1,000,000
2009 Plan [Member] | 2009 Plan [Member] | Incentive Stock Option [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Shares of common stock available for issuance 23,817,744   23,817,744              
Increase in number of shares of common stock available for issuance     4,250,000              
2012 Stock Repurchase Program [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Stock repurchase program, authorized amount           $ 14,000,000.0 $ 50,000,000.0 $ 40,000,000.0 $ 30,000,000.0  
Stock repurchase program, remaining authorized repurchase amount $ 15,500,000   $ 15,500,000