XML 86 R27.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Cash, Cash Equivalents and Short-term Investments (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2014
Cash, Cash Equivalents and Short-term Investments |
Summary of cash, cash equivalents and short-term investments | The following tables summarize the Company's cash, cash equivalents and short-term investments as of December 31, 2014 and December 31, 2013 (in thousands):
December 31, 2014 |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
Cash and money market funds |  | $ | 6,414 |  | $ | — |  | $ | — |  | $ | 6,414 |
Corporate debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |
Due in one year or less |  |  | 53,843 |  |  | 2 |  |  | (28 | ) |  | 53,817 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total |  | $ | 60,257 |  | $ | 2 |  | $ | (28 | ) | $ | 60,231 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Reported as: |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 6,414 |  | $ | — |  | $ | — |  | $ | 6,414 |
Short-term investments |  |  | 53,843 |  |  | 2 |  |  | (28 | ) |  | 53,817 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total |  | $ | 60,257 |  | $ | 2 |  | $ | (28 | ) | $ | 60,231 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2013 |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
Cash and money market funds |  | $ | 18,078 |  | $ | — |  | $ | — |  | $ | 18,078 |
Corporate debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |
Due in one year or less |  |  | 22,631 |  |  | 11 |  |  | (2 | ) |  | 22,640 |
Due in two years or less |  |  | 3,708 |  |  | 2 |  |  | (1 | ) |  | 3,709 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total |  | $ | 44,417 |  | $ | 13 |  | $ | (3 | ) | $ | 44,427 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Reported as: |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 18,078 |  | $ | — |  | $ | — |  | $ | 18,078 |
Short-term investments |  |  | 26,339 |  |  | 13 |  |  | (3 | ) |  | 26,349 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total |  | $ | 44,417 |  | $ | 13 |  | $ | (3 | ) | $ | 44,427 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​

X
- Details
Name: | ovas_CashCashEquivalentsAndMarketableSecuritiesAbstract
Namespace Prefix: | ovas_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of cash, cash equivalents and marketable securities. + References No definition available. + Details
Name: | ovas_ScheduleOfCashAndCashEquivalentsAndMarketableSecuritiesTableTextBlock
Namespace Prefix: | ovas_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration