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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Accumulated Other Comprehensive Income
Total
Balance as of beginning of the period at Dec. 31, 2017 $ 61 $ 866,330 $ (311,577) $ 4,089 $ 558,903
Balance as of beginning of the period (in shares) at Dec. 31, 2017 61,534,101        
Stockholders' Equity (Deficit)          
Exercise of stock options $ 1 8,642     8,643
Exercise of stock options (in shares) 651,010        
Issuance of restricted stock units (in shares) 95,094        
Stock-based compensation   7,832     7,832
Other comprehensive loss, net of tax       (648) (648)
Net loss     (23,862)   (23,862)
Balance as of end of the period at Mar. 31, 2018 $ 62 882,804 (335,439) 3,441 550,868
Balance as of end of the period (in shares) at Mar. 31, 2018 62,280,205        
Balance as of beginning of the period at Dec. 31, 2017 $ 61 866,330 (311,577) 4,089 558,903
Balance as of beginning of the period (in shares) at Dec. 31, 2017 61,534,101        
Stockholders' Equity (Deficit)          
Net loss         (48,941)
Balance as of end of the period at Jun. 30, 2018 $ 64 1,062,362 (360,518) (2,528) 699,380
Balance as of end of the period (in shares) at Jun. 30, 2018 64,278,782        
Balance as of beginning of the period at Dec. 31, 2017 $ 61 866,330 (311,577) 4,089 558,903
Balance as of beginning of the period (in shares) at Dec. 31, 2017 61,534,101        
Balance as of end of the period at Dec. 31, 2018 $ 70 1,434,780 (408,661) (13,070) 1,013,119
Balance as of end of the period (in shares) at Dec. 31, 2018 70,516,249        
Balance as of beginning of the period at Mar. 31, 2018 $ 62 882,804 (335,439) 3,441 550,868
Balance as of beginning of the period (in shares) at Mar. 31, 2018 62,280,205        
Stockholders' Equity (Deficit)          
Exercise of stock options $ 1 7,122     7,122
Exercise of stock options (in shares) 527,799        
Equity component of Convertible Senior Notes, net of issuance costs   91,392     91,392
Issuance of restricted stock units (in shares) 69,938        
Issuance of stock under employee stock purchase plan   1,423     1,423
Issuance of stock under employee stock purchase plan (in shares) 56,453        
Issuance of stock in acquisition $ 2 68,562     68,564
Issuance of stock in acquisition (in shares) 1,344,387        
Stock-based compensation   11,059     11,059
Other comprehensive loss, net of tax       (5,969) (5,969)
Net loss     (25,079)   (25,079)
Balance as of end of the period at Jun. 30, 2018 $ 64 1,062,362 (360,518) (2,528) 699,380
Balance as of end of the period (in shares) at Jun. 30, 2018 64,278,782        
Balance as of beginning of the period at Dec. 31, 2018 $ 70 1,434,780 (408,661) (13,070) 1,013,119
Balance as of beginning of the period (in shares) at Dec. 31, 2018 70,516,249        
Stockholders' Equity (Deficit)          
Exercise of stock options $ 1 8,853     8,854
Exercise of stock options (in shares) 564,102        
Issuance of restricted stock units (in shares) 383,060        
Stock-based compensation   13,523     13,523
Other comprehensive loss, net of tax       (3,788) (3,788)
Net loss     (30,150)   (30,150)
Balance as of end of the period at Mar. 31, 2019 $ 71 1,457,156 (438,811) (16,858) 1,001,558
Balance as of end of the period (in shares) at Mar. 31, 2019 71,463,411        
Balance as of beginning of the period at Dec. 31, 2018 $ 70 1,434,780 (408,661) (13,070) 1,013,119
Balance as of beginning of the period (in shares) at Dec. 31, 2018 70,516,249        
Stockholders' Equity (Deficit)          
Net loss         (59,474)
Balance as of end of the period at Jun. 30, 2019 $ 72 1,483,245 (468,135) (12,542) 1,002,640
Balance as of end of the period (in shares) at Jun. 30, 2019 71,934,381        
Balance as of beginning of the period at Mar. 31, 2019 $ 71 1,457,156 (438,811) (16,858) 1,001,558
Balance as of beginning of the period (in shares) at Mar. 31, 2019 71,463,411        
Stockholders' Equity (Deficit)          
Exercise of stock options $ 1 6,846     6,847
Exercise of stock options (in shares) 350,219        
Issuance of restricted stock units (in shares) 85,035        
Issuance of stock under employee stock purchase plan   1,875     1,875
Issuance of stock under employee stock purchase plan (in shares) 35,716        
Stock-based compensation   17,368     17,368
Other comprehensive loss, net of tax       4,316 4,316
Net loss     (29,324)   (29,324)
Balance as of end of the period at Jun. 30, 2019 $ 72 $ 1,483,245 $ (468,135) $ (12,542) $ 1,002,640
Balance as of end of the period (in shares) at Jun. 30, 2019 71,934,381