EQUITY (Details)
$ / shares in Units, $ in Thousands |
1 Months Ended |
12 Months Ended |
|
|
Oct. 31, 2016
USD ($)
$ / shares
shares
|
Jan. 31, 2016
USD ($)
$ / shares
shares
|
May 31, 2015
USD ($)
$ / shares
shares
|
Apr. 30, 2015 |
Mar. 31, 2015
USD ($)
shares
|
Dec. 31, 2016
USD ($)
$ / shares
shares
|
Dec. 31, 2015
USD ($)
$ / shares
shares
|
Dec. 31, 2014
shares
|
| Equity |
|
|
|
|
|
|
|
|
| Authorized common stock (in shares) |
|
|
|
|
|
100,000,000
|
100,000,000
|
|
| Par value of common stock (in dollars per share) | $ / shares |
|
|
|
|
|
$ 0.001
|
$ 0.001
|
|
| Common stock issued (in shares) |
|
|
|
|
|
29,364,100
|
20,739,351
|
|
| Net proceeds from public offering | $ |
|
|
|
|
|
$ 137,340
|
$ 72,029
|
|
| Common stock outstanding (in shares) |
|
|
|
|
|
29,364,100
|
20,739,351
|
|
| Authorized preferred stock (in shares) |
|
|
|
|
|
|
|
54,481,000
|
| Common stock split ratio |
|
|
|
0.1449
|
|
|
|
|
| Common stock reserved for future issuance (in shares) |
|
|
|
|
|
3,714
|
2,844
|
|
| Employee stock purchase plan |
|
|
|
|
|
|
|
|
| Equity |
|
|
|
|
|
|
|
|
| Common stock reserved for future issuance (in shares) |
|
|
|
|
|
364
|
200
|
|
| Initial public offering |
|
|
|
|
|
|
|
|
| Equity |
|
|
|
|
|
|
|
|
| Public offering of common stock, net of issuance costs, shares |
5,750,000
|
2,750,000
|
6,670,000
|
|
|
|
|
|
| Issue price (in dollars per share) | $ / shares |
$ 16.00
|
$ 20.00
|
$ 12.00
|
|
|
|
|
|
| Net proceeds from IPO | $ |
$ 86,166
|
$ 51,174
|
$ 72,029
|
|
|
|
|
|
| Conversion into common stock |
|
|
12,591,463
|
|
|
|
|
|
| Underwriters over-allotment option |
|
|
|
|
|
|
|
|
| Equity |
|
|
|
|
|
|
|
|
| Public offering of common stock, net of issuance costs, shares |
|
|
870,000
|
|
|
|
|
|
| Employee stock options |
|
|
|
|
|
|
|
|
| Equity |
|
|
|
|
|
|
|
|
| Common stock reserved for future issuance (in shares) |
|
|
|
|
|
3,348
|
2,642
|
|
| Warrants |
|
|
|
|
|
|
|
|
| Equity |
|
|
|
|
|
|
|
|
| Common stock reserved for future issuance (in shares) |
|
|
|
|
|
2
|
2
|
|
| Series A convertible redeemable preferred stock |
|
|
|
|
|
|
|
|
| Equity |
|
|
|
|
|
|
|
|
| Preferred stock issued (in shares) |
|
|
|
|
|
|
|
9,232,334
|
| Preferred stock outstanding (in shares) |
|
|
|
|
|
|
|
9,232,334
|
| Series B convertible redeemable preferred stock |
|
|
|
|
|
|
|
|
| Equity |
|
|
|
|
|
|
|
|
| Preferred stock issued (in shares) |
|
|
|
|
|
|
|
27,324,237
|
| Preferred stock outstanding (in shares) |
|
|
|
|
|
|
|
27,324,237
|
| Series C convertible redeemable preferred stock |
|
|
|
|
|
|
|
|
| Equity |
|
|
|
|
|
|
|
|
| Preferred stock issued (in shares) |
|
|
|
|
|
|
|
8,658,008
|
| Preferred stock outstanding (in shares) |
|
|
|
|
|
|
|
8,658,008
|
| Series D convertible redeemable preferred stock |
|
|
|
|
|
|
|
|
| Equity |
|
|
|
|
|
|
|
|
| Aggregate consideration | $ |
|
|
|
|
$ 50,000
|
|
$ 44,807
|
|
| Proceeds from Issuance of Convertible Preferred Stock | $ |
|
|
|
|
$ 45,000
|
|
|
|
| Conversion into bridge notes |
|
|
|
|
5,000,000
|
|
|
|
| Public offering of common stock, net of issuance costs, shares |
|
|
|
|
4,166,667
|
|
|
|