XML 47 R37.htm IDEA: XBRL DOCUMENT v3.19.1
Stock-Based Compensation - Summary of Option and RSU Activity (Detail) - Equity Incentive Plan 2010
shares in Thousands
 3 Months Ended
Mar. 31, 2019
$ / shares
shares
Number of shares  
Balance at the beginning of the year (in shares) 4,007
Options granted (in shares) (1,297)
Options cancelled and returned to Plan (in shares) 1
Balance at the end of the period (in shares) 744
Number of shares  
Balance at the beginning of the year (in shares) 337
Options granted (in shares) 1,297
Options cancelled and returned to Plan (in shares) (1)
Balance at the end of the period (in shares) 1,633
Weighted Average Exercise Prices  
Weighted-average exercise price (in dollars per share) | $ / shares $ 4.19
Options granted (in dollars per share) | $ / shares 0.20
Options cancelled and returned to Plan (in dollars per share) | $ / shares 7.20
Weighted-average exercise price (in dollars per share) | $ / shares $ 1.02
RSU's  
Number of shares  
RSUs granted (in shares) (2,028)
RSUs cancelled and returned to Plan (in shares) 11
Number of shares  
RSUs granted (in shares) 2,028
RSUs cancelled and returned to Plan (in shares) 11
Options  
Number of shares  
Additional shares authorized under the Plan 50
Number of shares  
Additional shares authorized under the Plan 50