Income Taxes - Additional Information (Details) - USD ($)
$ in Thousands |
1 Months Ended |
12 Months Ended |
Nov. 30, 2016 |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
| Income Tax Contingency [Line Items] |
|
|
|
|
| Accumulated earnings of foreign subsidiaries |
|
$ 913
|
|
|
| Valuation allowance released as a result of acquisition to recognize income tax benefit |
|
328
|
$ 0
|
$ 6,821
|
| Valuation allowance movements |
|
18,240
|
$ 795
|
|
| CrowdStar |
|
|
|
|
| Income Tax Contingency [Line Items] |
|
|
|
|
| Valuation allowance released as a result of acquisition to recognize income tax benefit |
$ 328
|
|
|
|
| Federal Tax |
|
|
|
|
| Income Tax Contingency [Line Items] |
|
|
|
|
| Net operating loss carryforwards |
|
158,531
|
|
|
| U S State |
|
|
|
|
| Income Tax Contingency [Line Items] |
|
|
|
|
| Net operating loss carryforwards |
|
97,627
|
|
|
| Federal Research And Development Credits | Research and Development Tax Credit Carryforward |
|
|
|
|
| Income Tax Contingency [Line Items] |
|
|
|
|
| Tax credit carryforward amount |
|
11,158
|
|
|
| California Research And Development Tax Credit | Research and Development Tax Credit Carryforward |
|
|
|
|
| Income Tax Contingency [Line Items] |
|
|
|
|
| Tax credit carryforward amount |
|
12,941
|
|
|
| Foreign |
|
|
|
|
| Income Tax Contingency [Line Items] |
|
|
|
|
| Tax credit carryforward amount |
|
$ 6,320
|
|
|