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Cash and Cash Equivalents, Short-term Investments and Fair Value of Financial Instruments (Details) avail for sasle securities levels 1-2-3 table (USD $)
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9 Months Ended | |
|---|---|---|
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Sep. 30, 2013
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Dec. 31, 2012
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| Cash and Cash Equivalents [Line Items] | ||
| Money Market Fund - daily traded value | $ 1.00 | |
| Cash, Cash Equivalents, and Short-term Investments | 116,190,000 | 62,313,000 |
|
Fair Value, Measurements, Recurring [Member]
|
||
| Cash and Cash Equivalents [Line Items] | ||
| Cash, Cash Equivalents, and Short-term Investments | 64,775,000 | 38,891,000 |
|
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
|
||
| Cash and Cash Equivalents [Line Items] | ||
| Cash, Cash Equivalents, and Short-term Investments | 64,775,000 | 38,891,000 |
|
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
|
||
| Cash and Cash Equivalents [Line Items] | ||
| Cash, Cash Equivalents, and Short-term Investments | 0 | 0 |
|
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
|
||
| Cash and Cash Equivalents [Line Items] | ||
| Cash, Cash Equivalents, and Short-term Investments | 0 | 0 |
|
Money Market Funds [Member]
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||
| Cash and Cash Equivalents [Line Items] | ||
| Cash and Cash Equivalents, Fair Value Disclosure | 38,891,000 | |
|
Money Market Funds [Member] | Fair Value, Measurements, Recurring [Member]
|
||
| Cash and Cash Equivalents [Line Items] | ||
| Cash and Cash Equivalents, Fair Value Disclosure | 64,775,000 | 38,891,000 |
|
Money Market Funds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
|
||
| Cash and Cash Equivalents [Line Items] | ||
| Cash and Cash Equivalents, Fair Value Disclosure | 38,891,000 | |
| Cash, Cash Equivalents, and Short-term Investments | 64,775,000 | |
|
Money Market Funds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
|
||
| Cash and Cash Equivalents [Line Items] | ||
| Cash and Cash Equivalents, Fair Value Disclosure | 0 | 0 |
|
Money Market Funds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
|
||
| Cash and Cash Equivalents [Line Items] | ||
| Cash and Cash Equivalents, Fair Value Disclosure | $ 0 | $ 0 |