Redeemable Preferred Stock (Details)
|
|
|
|
1 Months Ended |
12 Months Ended |
|
|
|
Dec. 22, 2016
$ / shares
shares
|
Aug. 26, 2014
$ / shares
shares
|
May 08, 2013
USD ($)
item
shares
|
Dec. 31, 2016
USD ($)
item
$ / shares
shares
|
Dec. 31, 2016
USD ($)
$ / shares
shares
|
Dec. 31, 2014
USD ($)
shares
|
Dec. 31, 2013
shares
|
Dec. 31, 2015
$ / shares
shares
|
May 16, 2013
shares
|
| Redeemable preferred stock |
|
|
|
|
|
|
|
|
|
| Shares of common stock that can be purchased from warrants issued in an underwritten public offering (in shares) |
|
|
|
3,120,000
|
3,120,000
|
|
|
|
|
| Net proceeds from public offering | $ |
|
|
|
$ 11,900,000
|
$ 27,500,000
|
$ 165,700,000
|
|
|
|
| Proceeds from Issuance of Warrants | $ |
|
|
|
|
|
$ 11,800,000
|
|
|
|
| Weighted average exercise price of warrants (in dollars per share) | $ / shares |
|
|
|
$ 1.50
|
$ 1.50
|
|
|
|
|
| Common Stock |
|
|
|
|
|
|
|
|
|
| Redeemable preferred stock |
|
|
|
|
|
|
|
|
|
| Shares issued upon conversion of redeemable stock (in shares) |
|
|
|
|
|
5,521,676
|
|
|
|
| Series C Redeemable Convertible Preferred Stock |
|
|
|
|
|
|
|
|
|
| Redeemable preferred stock |
|
|
|
|
|
|
|
|
|
| Redeemable stock issued (in shares) |
|
|
|
5,231
|
5,231
|
|
|
5,231
|
10,431
|
| Redeemable stock issued, stated value (in dollars per share) | $ / shares |
|
|
|
$ 0.01
|
$ 0.01
|
|
|
$ 0.01
|
|
| Shares issued upon conversion of redeemable stock (in shares) |
|
|
|
|
|
|
5,200
|
|
|
| Redeemable convertible Preferred Stock, shares outstanding |
|
|
|
5,231
|
5,231
|
|
|
5,231
|
|
| Series C Redeemable Convertible Preferred Stock | Air Liquide |
|
|
|
|
|
|
|
|
|
| Redeemable preferred stock |
|
|
|
|
|
|
|
|
|
| Redeemable stock issued (in shares) |
|
|
10,431
|
5,231
|
5,231
|
|
|
|
|
| Number of directors entitled to designate on board under Securities Purchase Agreement | item |
|
|
1
|
|
|
|
|
|
|
| Dividend rate |
|
|
|
|
8.00%
|
|
|
|
|
| Aggregate purchase price of shares issued | $ |
|
|
$ 2,595,400
|
|
|
|
|
|
|
| Conversion price per share | $ / shares |
|
$ 0.2343
|
|
|
|
|
|
|
|
| Shares issued upon conversion of redeemable stock (in shares) |
|
(5,200)
|
|
|
|
|
|
|
|
| Adjusted conversion price per share | $ / shares |
|
|
|
$ 0.2343
|
$ 0.2343
|
|
|
$ 0.2343
|
|
| Series C Redeemable Convertible Preferred Stock | Air Liquide | Common Stock |
|
|
|
|
|
|
|
|
|
| Redeemable preferred stock |
|
|
|
|
|
|
|
|
|
| Shares issued upon conversion of redeemable stock (in shares) |
|
5,521,676
|
|
|
|
|
|
|
|
| Series D Redeemable Convertible Preferred Stock |
|
|
|
|
|
|
|
|
|
| Redeemable preferred stock |
|
|
|
|
|
|
|
|
|
| Redeemable stock issued (in shares) |
18,500
|
|
|
18,500
|
18,500
|
|
|
0
|
|
| Redeemable stock issued, par value (in dollars per share) | $ |
|
|
|
$ 0.01
|
$ 0.01
|
|
|
|
|
| Redeemable stock issued, stated value (in dollars per share) | $ / shares |
$ 1,000
|
|
|
$ 0.01
|
$ 0.01
|
|
|
$ 0.01
|
|
| Net proceeds from public offering | $ |
|
|
|
$ 15,600,000
|
|
|
|
|
|
| Preferred stock, number of monthly redemption installments. | item |
|
|
|
10
|
|
|
|
|
|
| Preferred stock redemption, monthly installment amount | $ |
|
|
|
$ 1,900,000
|
|
|
|
|
|
| Conversion discount, percent of market value |
12.00%
|
|
|
|
|
|
|
|
|
| Conversion price per share (in dollars per share) | $ / shares |
$ 1.55
|
|
|
|
|
|
|
|
|
| Shares issued upon conversion of redeemable stock (in shares) |
|
|
|
|
0
|
|
|
|
|
| Redeemable convertible Preferred Stock, shares outstanding |
|
|
|
18,500
|
18,500
|
|
|
|
|
| Underwriters agreement |
|
|
|
|
|
|
|
|
|
| Redeemable preferred stock |
|
|
|
|
|
|
|
|
|
| Shares of common stock that can be purchased from warrants issued in an underwritten public offering (in shares) |
|
|
|
7,381,500
|
7,381,500
|
|
|
|
|