Notes Payable (Narrative) (Details) - USD ($)
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3 Months Ended |
9 Months Ended |
Jul. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
| Oxford Finance LLC and Silicon Valley Bank |
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| Debt Instrument [Line Items] |
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| Interest expense |
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$ 300,000
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$ 200,000
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$ 800,000
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$ 200,000
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| Effective interest rate (in percentage) |
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11.72%
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11.72%
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| Notes Payable | Secured Debt | Oxford Finance LLC and Silicon Valley Bank |
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| Debt Instrument [Line Items] |
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| Debt instrument, maximum borrowing capacity |
$ 20,000,000
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| Notes payable, gross |
10,000,000
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$ 10,000,000
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$ 10,000,000
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| Remaining borrowing capacity |
10,000,000
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| Proceeds from sale of equity |
$ 15,000,000
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| Stated interest rate ( in percentage) |
8.275%
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| Periodic payment terms, balloon payment to be paid, percentage of funded borrowings (in percentage) |
3.00%
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| Proceeds from debt, net of issuance costs |
$ 9,700,000
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| Notes Payable | Secured Debt | Oxford Finance LLC and Silicon Valley Bank | Minimum |
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| Debt Instrument [Line Items] |
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| Early extinguishment of debt, prepayment fee (in percentage) |
1.00%
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| Notes Payable | Secured Debt | Oxford Finance LLC and Silicon Valley Bank | Maximum |
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| Debt Instrument [Line Items] |
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| Early extinguishment of debt, prepayment fee (in percentage) |
3.00%
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| Notes Payable | Secured Debt | Oxford Finance LLC and Silicon Valley Bank | LIBOR |
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| Debt Instrument [Line Items] |
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| Basis spread on variable rate (in percentage) |
8.085%
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| Common stock warrants |
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| Debt Instrument [Line Items] |
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| Warrants issued (in shares) |
97,680
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| Exercise price of warrants (usd per share) |
$ 4.095
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| Warrants outstanding |
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$ 300,000
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$ 300,000
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