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Stock-Based Compensation | 9 Months Ended
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Dec. 31, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Stock-Based Compensation | 2. Stock-Based Compensation The Company accounts for its stock-based compensation at fair value. The following table summarizes stock-based compensation expense by financial statement line item for the three and nine months ended December 31, 2015 and 2014 (in thousands):
| Three months ended December 31, |  |  | Nine months ended December 31, |
| 2015 |  |  | 2014 |  |  | 2015 |  |  | 2014 |
Cost of revenues | $ | 55 |  |  | $ | 186 |  |  | $ | 213 |  |  | $ | 533 |
Research and development |  | 89 |  |  |  | 419 |  |  |  | 373 |  |  |  | 1,418 |
Selling, general and administrative |  | 564 |  |  |  | 916 |  |  |  | 1,956 |  |  |  | 2,669 |
Total | $ | 708 |  |  | $ | 1,521 |  |  | $ | 2,542 |  |  | $ | 4,620 |
During the nine months ended December 31, 2015, the Company granted 420,189 restricted stock awards. These awards generally vest over 3 years. D uring the nine months ended December 31, 2014, the Company granted 1 00,0 0 0 stock options and 3 24,300 restricted stock awards. The stock options vest over 5 years, and the restricted stock awards generally vest over three year s. Awards for res tricted stock include both time-based and performance-based awards. For options and awards that vest upon the passage of time, expense is being recorded over the vesting period. Performance-based awards are expensed over the requisite service period based on probability of achievement. The estimated fair value of the Company’s stock-based awards, less expected annual forfeitures, is amortized over the awards’ service period. The total unrecognized compensation cost for unvested outstanding stock options was $0.8 million at December 31, 2015. This expense will be recognized over a weighted average expense period of approximately 2.6 years. The total unrecognized compensation cost for unvested outstanding restricted stock was $3.1 million at December 31, 2015. This expense will be recognized over a weighted-average expense period of approximately 2.0 years. The weighted average assumptions used in the Black-Scholes valuation model for stock options granted during the three and nine months ended December 31, 2015 and 2014 are as follows:
| Three months ended December 31, |  | Nine months ended December 31, |
| 2015 |  | 2014 |  | 2015 |  | 2014 |
Expected volatility | N/A |  | N/A |  | N/A |  |  | 85.5 | %
Risk-free interest rate | N/A |  | N/A |  | N/A |  |  | 1.9 | %
Expected life (years) | N/A |  | N/A |  | N/A |  |  | 5.8 |
Dividend yield | None |  | None |  | None |  | None |

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51659978&loc=d3e25284-112666 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 + Details
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