CONVERTIBLE PREFERRED STOCK WARRANTS (Details) - USD ($)
$ / shares in Units, $ in Thousands |
3 Months Ended |
6 Months Ended |
|
|
Jan. 31, 2017 |
Jan. 31, 2017 |
Nov. 01, 2016 |
Jul. 31, 2016 |
| Class of Warrant or Right [Line Items] |
|
|
|
|
| Number of Shares (in shares) |
824,094
|
824,094
|
|
|
| Fair value |
$ 0
|
$ 0
|
$ 30,812
|
$ 9,679
|
| Series A Warrants, Issued December 2009 |
|
|
|
|
| Class of Warrant or Right [Line Items] |
|
|
|
|
| Contractual Term (in years) |
|
10 years
|
|
|
| Number of Shares (in shares) |
683,644
|
683,644
|
|
|
| Exercise Price per Share (in dollars per share) |
$ 0.234
|
$ 0.234
|
|
|
| Fair value |
|
|
25,883
|
8,259
|
| Series A Warrants, Issued May 2010 |
|
|
|
|
| Class of Warrant or Right [Line Items] |
|
|
|
|
| Contractual Term (in years) |
|
10 years
|
|
|
| Number of Shares (in shares) |
85,450
|
85,450
|
|
|
| Exercise Price per Share (in dollars per share) |
$ 0.234
|
$ 0.234
|
|
|
| Fair value |
|
|
3,235
|
1,032
|
| Series D Warrants, Issued November 2013 |
|
|
|
|
| Class of Warrant or Right [Line Items] |
|
|
|
|
| Contractual Term (in years) |
|
10 years
|
|
|
| Number of Shares (in shares) |
10,000
|
10,000
|
|
|
| Exercise Price per Share (in dollars per share) |
$ 7.289
|
$ 7.289
|
|
|
| Fair value |
|
|
308
|
77
|
| Series D Warrants, Issued December 2013 |
|
|
|
|
| Class of Warrant or Right [Line Items] |
|
|
|
|
| Contractual Term (in years) |
|
7 years
|
|
|
| Number of Shares (in shares) |
45,000
|
45,000
|
|
|
| Exercise Price per Share (in dollars per share) |
$ 7.289
|
$ 7.289
|
|
|
| Fair value |
|
|
$ 1,386
|
$ 311
|
| Common Class B Warrant |
|
|
|
|
| Class of Warrant or Right [Line Items] |
|
|
|
|
| Number of Shares (in shares) |
51,270
|
51,270
|
|
|
| Number of warrants exercised (in shares) |
717,824
|
772,824
|
|
|
| Exercise of warrants (in shares) |
711,935
|
758,464
|
|
|