XML 98 R66.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Stock-Based Compensation (Tables) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |
Summary of stock option activity and related information | A summary of our stock option activity and related information as of June 30, 2018 is as follows:
| Shares |  | Weighted average exercise price per share |  | Weighted average remaining contractual term (years) |  | Aggregate intrinsic value (in thousands)
Outstanding at December 31, 2017 | 5,745,815 |  |  | $ | 7.28 |  |  | 8.32 |  | $ | 43 |
Granted | 1,179,877 |  |  | 0.96 |  |  |  |  |  |
Forfeited/Canceled | (1,529,717 | ) |  | 5.90 |  |  |  |  |  |
Outstanding at June 30 | 5,395,975 |  |  | 6.28 |  |  | 8.05 |  | 1 |
Exercisable at June 30, 2018 | 2,576,138 |  |  | 10.88 |  |  | 6.96 |  | 1 |
| A summary of our stock option activity and related information is as follows:
| Shares |  | Weighted average exercise price per share |  | Weighted average remaining contractual term (years) |  | Aggregate intrinsic value (in thousands)
Outstanding at December 31, 2016 | 4,611,392 |  |  | $ | 14.42 |  |  | 8.23 |  | $ | 45 |
Granted | 4,386,856 |  |  | 1.51 |  |  |  |  |
Forfeited / Canceled | (3,252,433 | ) |  | 9.63 |  |  |  |  |
Outstanding at December 31, 2017 | 5,745,815 |  |  | 7.28 |  |  | 8.32 |  | 43 |
Exercisable at December 31, 2017 | 2,370,335 |  |  | 13.37 |  |  | 7.08 |  | 42 |
Vested and expected to vest at December 31, 2017 | 5,745,815 |  |  | 7.28 |  |  | 8.32 |  | 43 |
Schedule of assumptions used to estimate fair value of each stock option | The fair value of each stock-based option award is estimated on the grant date using the Black-Scholes option pricing model with the following assumptions:
| Three months ended June 30, |  | Six months ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Risk-free interest rate | — |  | 1.3% - 2.0% |  | 2.7% |  | 1.3% - 2.2%
Dividend yield | — |  | — |  | — |  | —
Volatility | — |  | 89% - 109% |  | 83% - 85% |  | 89% - 109%
Expected term (years) |  |  | 1.8 - 6.9 |  | 6.1 |  | 1.8 - 6.9
| The fair value of each stock option is estimated using the Black-Scholes option pricing model using the following assumptions:
| December 31,
| 2017 |  | 2016 |  | 2015
Risk-free interest rate | 1.3%-2.2% |  | 1.3%-2.0% |  | 1.6%-2.3%
Dividend yield | — |  | — |  | —
Volatility | 87%-109% |  | 78%-89% |  | 72%-78%
Expected term (years) | 2.0-6.9 |  | 5.3-9.9 |  | 5.3-9.9
Schedule of restricted stock unit activity |  | A summary of our restricted stock unit ("RSU") activity and related information is as follows:
| Shares |  | Weighted average grant date fair value
Outstanding at December 31, 2016 | 50,000 |  |  | $ | 7.15 |
Granted | — |  |  | — |
Vested | — |  |  | — |
Forfeited | (50,000 | ) |  | 7.15 |
Outstanding at December 31, 2017 | — |  |  | $ | — |
Summary of awards |  | The following table summarizes the December 9, 2014 award.
Award Type | Number of RSUs Granted |  | Grant Date Fair Value |  | RSUs Vested as of December 31, 2015
Service-based | 30,902 |  |  | $ | 32.36 |  |  | 15,450 |
Performance-based - Year 1 | 11,588 |  |  | $ | 43.47 |  |  | 4,635 |
Performance-based - Year 2 | 11,588 |  |  | $ | — |  |  | — |

X
- References No definition available. + Details
Name: | us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the changes in outstanding nonvested shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfNonvestedShareActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
Name: | us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration