Long-Term Debt - Additional Information (Detail) - USD ($)
|
|
9 Months Ended |
|
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
Dec. 31, 2015 |
| Debt Instrument [Line Items] |
|
|
|
|
| Proceeds from sale of common stock |
|
$ 61,287,000
|
$ 70,435,000
|
|
| Long-term debt obligation |
|
19,653,000
|
|
$ 19,565,000
|
| Hercules Term Loan [Member] |
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
| Principal amount outstanding |
$ 40,000,000
|
|
40,000,000
|
|
| Initial principal amount drawn |
20,000,000
|
|
20,000,000
|
|
| Remaining available amount under loan agreement |
20,000,000
|
$ 20,000,000
|
20,000,000
|
|
| Minimum incremental option to withdraw on loan |
$ 10,000,000
|
|
$ 10,000,000
|
|
| Loan agreement description |
|
Under the Loan Agreement, Hercules will provide the Company with access to term loans with an aggregate principal amount of up to $40.0 million, or the Term Loan. The Company initially drew a principal amount of $20.0 million, which was funded on September 30, 2015. The remaining $20.0 million available under the Loan Agreement can be drawn at the Company’s option in minimum increments of $10.0 million through December 31, 2016, or the Draw Period.
|
|
|
| Loan agreement payment terms |
|
The Term Loan is repayable in monthly installments commencing on April 1, 2018 through maturity on September 1, 2020.
|
|
|
| Loan repayment commencement date |
Apr. 01, 2018
|
|
|
|
| Loan maturity date |
Sep. 01, 2020
|
|
|
|
| Loan interest rate description |
|
The interest rate is equal to the greater of (i) 8.5%, or (ii) the sum of 8.5%, plus the “prime rate” as reported in The Wall Street Journal minus 5.75% per annum.
|
|
|
| Basis spread on prime rate |
5.75%
|
|
|
|
| End of term charge |
4.50%
|
|
4.50%
|
|
| Additional interest rate on default |
5.00%
|
|
|
|
| Minimum subordinated debt for event of default |
$ 1,000,000
|
|
$ 1,000,000
|
|
| Debt issuance costs |
$ 511,000
|
|
511,000
|
|
| Warrants issued to purchase common stock |
32,692
|
|
|
|
| Warrants exercise price |
$ 24.47
|
|
|
|
| Fair value of warrants |
$ 288,000
|
|
288,000
|
|
| Aggregate amount of warrant fair and fees paid |
572,000
|
|
|
|
| Cost allocated to debt discount amortized as additional interest expense |
208,000
|
|
|
|
| Cost allocated to prepaid expenses and are being amortized |
$ 364,000
|
|
$ 364,000
|
|
| Long-term debt obligation |
|
$ 19,700,000
|
|
|
| Debt discount, net |
|
300,000
|
|
|
| Prepaid expenses |
|
$ 100,000
|
|
|
| Hercules Term Loan [Member] | Hercules [Member] |
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
| Rights to purchase common stock, exercised |
44,782
|
|
|
|
| Proceeds from sale of common stock |
$ 1,000,000
|
|
|
|
| Hercules Term Loan [Member] | Hercules Technology II, L.P. [Member] |
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
| Warrants issued to purchase common stock |
16,346
|
|
|
|
| Hercules Term Loan [Member] | Hercules Technology III, L.P. [Member] |
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
| Warrants issued to purchase common stock |
16,346
|
|
|
|
| Hercules Term Loan [Member] | Prior to April 1, 2018 |
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
| Percentage of prepayment |
|
2.00%
|
|
|
| Hercules Term Loan [Member] | On Or After April One Two Thousand Eighteen |
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
| Prepayment fee |
|
$ 0
|
|
|
| Hercules Term Loan [Member] | Minimum [Member] |
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
| Loan interest rate |
8.50%
|
|
8.50%
|
|
| Hercules Term Loan [Member] | Maximum [Member] | Hercules [Member] |
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
| Rights granted in subsequent sales and issuance of equity securities |
$ 2,000,000
|
|
$ 2,000,000
|
|