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Redeemable Convertible Preferred Stock and Shareholders' Equity (Deficit) - Summary of Redeemable Convertible Preferred Stock (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
|
9 Months Ended |
12 Months Ended |
|
Sep. 30, 2013
|
Sep. 30, 2012
|
Dec. 31, 2012
|
Dec. 31, 2011
|
| Temporary Equity [Line Items] |
|
|
|
|
| Accretion of dividends |
$ 18,391 |
$ 16,291 |
$ 21,994 |
$ 13,868 |
|
Series A Redeemable Convertible Preferred Stock [Member]
|
|
|
|
|
| Temporary Equity [Line Items] |
|
|
|
|
| Beginning Balance |
1,358 |
802 |
802 |
802 |
| Issuance of shares |
|
|
|
|
| Accretion of dividends |
52 |
|
556 |
|
| Stock issuance costs |
|
|
|
|
| Conversion to common stock |
(1,410) |
|
|
|
| Settlement of fractional shares upon conversion to common stock |
|
|
|
|
| Ending Balance |
|
|
1,358 |
802 |
| Beginning Balance, Shares |
705,400 |
705,400 |
705,400 |
705,400 |
| Issuance of shares, Shares |
|
|
|
|
| Conversion to common stock, Shares |
(705,400) |
|
|
|
| Settlement of fractional shares upon conversion to common stock, Shares |
|
|
|
|
| Ending Balance, Shares |
0 |
|
705,400 |
705,400 |
|
Series B Redeemable Convertible Preferred Stock [Member]
|
|
|
|
|
| Temporary Equity [Line Items] |
|
|
|
|
| Beginning Balance |
669 |
639 |
639 |
609 |
| Issuance of shares |
|
|
|
|
| Accretion of dividends |
19 |
|
30 |
30 |
| Stock issuance costs |
|
|
|
|
| Conversion to common stock |
(688) |
|
|
|
| Settlement of fractional shares upon conversion to common stock |
|
|
|
|
| Ending Balance |
|
|
669 |
639 |
| Beginning Balance, Shares |
694,000 |
694,000 |
694,000 |
694,000 |
| Issuance of shares, Shares |
|
|
|
|
| Conversion to common stock, Shares |
(694,000) |
|
|
|
| Settlement of fractional shares upon conversion to common stock, Shares |
|
|
|
|
| Ending Balance, Shares |
0 |
|
694,000 |
694,000 |
|
Series B-1 Redeemable Convertible Preferred Stock [Member]
|
|
|
|
|
| Temporary Equity [Line Items] |
|
|
|
|
| Beginning Balance |
1,360 |
1,300 |
1,300 |
1,240 |
| Issuance of shares |
|
|
|
|
| Accretion of dividends |
37 |
|
60 |
60 |
| Stock issuance costs |
|
|
|
|
| Conversion to common stock |
(1,397) |
|
|
|
| Settlement of fractional shares upon conversion to common stock |
|
|
|
|
| Ending Balance |
|
|
1,360 |
1,300 |
| Beginning Balance, Shares |
1,212,360 |
1,212,360 |
1,212,360 |
1,212,360 |
| Issuance of shares, Shares |
|
|
|
|
| Conversion to common stock, Shares |
(1,212,360) |
|
|
|
| Settlement of fractional shares upon conversion to common stock, Shares |
|
|
|
|
| Ending Balance, Shares |
0 |
|
1,212,360 |
1,212,360 |
|
Series C Redeemable Convertible Preferred Stock [Member]
|
|
|
|
|
| Temporary Equity [Line Items] |
|
|
|
|
| Beginning Balance |
7,134 |
6,729 |
6,729 |
6,346 |
| Issuance of shares |
|
|
|
|
| Accretion of dividends |
266 |
|
405 |
383 |
| Stock issuance costs |
|
|
|
|
| Conversion to common stock |
(7,400) |
|
|
|
| Settlement of fractional shares upon conversion to common stock |
|
|
|
|
| Ending Balance |
|
|
7,134 |
6,729 |
| Beginning Balance, Shares |
4,546,360 |
4,546,360 |
4,546,360 |
4,546,360 |
| Issuance of shares, Shares |
|
|
|
|
| Conversion to common stock, Shares |
(4,546,360) |
|
|
|
| Settlement of fractional shares upon conversion to common stock, Shares |
|
|
|
|
| Ending Balance, Shares |
0 |
|
4,546,360 |
4,546,360 |
|
Series C-1 Redeemable Convertible Preferred Stock [Member]
|
|
|
|
|
| Temporary Equity [Line Items] |
|
|
|
|
| Beginning Balance |
34,201 |
32,264 |
32,264 |
30,436 |
| Issuance of shares |
|
|
|
|
| Accretion of dividends |
1,272 |
|
1,937 |
1,828 |
| Stock issuance costs |
|
|
|
|
| Conversion to common stock |
(35,473) |
|
|
|
| Settlement of fractional shares upon conversion to common stock |
|
|
|
|
| Ending Balance |
|
|
34,201 |
32,264 |
| Beginning Balance, Shares |
15,934,528 |
15,934,528 |
15,934,528 |
15,934,528 |
| Issuance of shares, Shares |
|
|
|
|
| Conversion to common stock, Shares |
(15,934,528) |
|
|
|
| Settlement of fractional shares upon conversion to common stock, Shares |
|
|
|
|
| Ending Balance, Shares |
0 |
|
15,934,528 |
15,934,528 |
|
Series C-2 Redeemable Convertible Preferred Stock [Member]
|
|
|
|
|
| Temporary Equity [Line Items] |
|
|
|
|
| Beginning Balance |
44,512 |
41,987 |
41,987 |
39,605 |
| Issuance of shares |
|
|
|
|
| Accretion of dividends |
1,660 |
|
2,525 |
2,382 |
| Stock issuance costs |
|
|
|
|
| Conversion to common stock |
(46,172) |
|
|
|
| Settlement of fractional shares upon conversion to common stock |
|
|
|
|
| Ending Balance |
|
|
44,512 |
41,987 |
| Beginning Balance, Shares |
18,617,020 |
18,617,020 |
18,617,020 |
18,617,020 |
| Issuance of shares, Shares |
|
|
|
|
| Conversion to common stock, Shares |
(18,617,020) |
|
|
|
| Settlement of fractional shares upon conversion to common stock, Shares |
|
|
|
|
| Ending Balance, Shares |
0 |
|
18,617,020 |
18,617,020 |
|
Series C-3 Redeemable Convertible Preferred Stock [Member]
|
|
|
|
|
| Temporary Equity [Line Items] |
|
|
|
|
| Beginning Balance |
29,770 |
28,082 |
28,082 |
26,489 |
| Issuance of shares |
|
|
|
|
| Accretion of dividends |
1,103 |
|
1,688 |
1,593 |
| Stock issuance costs |
|
|
|
|
| Conversion to common stock |
(30,873) |
|
|
|
| Settlement of fractional shares upon conversion to common stock |
|
|
|
|
| Ending Balance |
|
|
29,770 |
28,082 |
| Beginning Balance, Shares |
13,297,872 |
13,297,872 |
13,297,872 |
13,297,872 |
| Issuance of shares, Shares |
|
|
|
|
| Conversion to common stock, Shares |
(13,297,872) |
|
|
|
| Settlement of fractional shares upon conversion to common stock, Shares |
|
|
|
|
| Ending Balance, Shares |
0 |
|
13,297,872 |
13,297,872 |
|
Series D Redeemable Convertible Preferred Stock [Member]
|
|
|
|
|
| Temporary Equity [Line Items] |
|
|
|
|
| Beginning Balance |
76,252 |
71,924 |
71,924 |
39,019 |
| Issuance of shares |
|
|
|
28,942 |
| Accretion of dividends |
2,827 |
|
4,328 |
3,971 |
| Stock issuance costs |
|
|
|
(8) |
| Conversion to common stock |
(79,078) |
|
|
|
| Settlement of fractional shares upon conversion to common stock |
(1) |
|
|
|
| Ending Balance |
|
|
76,252 |
71,924 |
| Beginning Balance, Shares |
19,803,685 |
19,803,685 |
19,803,685 |
11,240,794 |
| Issuance of shares, Shares |
|
|
|
8,562,891 |
| Conversion to common stock, Shares |
(19,803,685) |
|
|
|
| Settlement of fractional shares upon conversion to common stock, Shares |
|
|
|
|
| Ending Balance, Shares |
0 |
|
19,803,685 |
19,803,685 |
|
Series E Redeemable Convertible Preferred Stock [Member]
|
|
|
|
|
| Temporary Equity [Line Items] |
|
|
|
|
| Beginning Balance |
211,403 |
117,954 |
117,954 |
|
| Issuance of shares |
|
|
83,000 |
117,000 |
| Accretion of dividends |
7,931 |
|
10,465 |
3,621 |
| Stock issuance costs |
|
|
(16) |
(2,667) |
| Conversion to common stock |
(219,332) |
|
|
|
| Settlement of fractional shares upon conversion to common stock |
(2) |
|
|
|
| Ending Balance |
|
|
211,403 |
117,954 |
| Beginning Balance, Shares |
38,095,239 |
22,285,716 |
22,285,716 |
|
| Issuance of shares, Shares |
|
|
15,809,523 |
22,285,716 |
| Conversion to common stock, Shares |
(38,095,239) |
|
|
|
| Settlement of fractional shares upon conversion to common stock, Shares |
|
|
|
|
| Ending Balance, Shares |
0 |
|
38,095,239 |
22,285,716 |
|
Series F Redeemable Convertible Preferred Stock [Member]
|
|
|
|
|
| Temporary Equity [Line Items] |
|
|
|
|
| Beginning Balance |
|
|
|
|
| Issuance of shares |
150,000 |
|
|
|
| Accretion of dividends |
3,224 |
|
|
|
| Stock issuance costs |
(3,148) |
|
|
|
| Conversion to common stock |
(150,075) |
|
|
|
| Settlement of fractional shares upon conversion to common stock |
(1) |
|
|
|
| Ending Balance |
$ 0 |
|
|
|
| Beginning Balance, Shares |
|
|
|
|
| Issuance of shares, Shares |
19,047,619 |
|
|
|
| Conversion to common stock, Shares |
(19,047,619) |
|
|
|
| Settlement of fractional shares upon conversion to common stock, Shares |
|
|
|
|
| Ending Balance, Shares |
0 |
|
|
|