XML 31 R17.htm IDEA: XBRL DOCUMENT
v3.20.4

Capital Structure | 12 Months Ended
--- | ---
Dec. 31, 2020
Stockholders' Equity Note [Abstract] |
Capitalization | 9. Capital structure Common stock In April 2018, the Company closed an underwritten public offering of its common stock. The Company issued and sold an aggregate of 4,600,000 shares of common stock at a public offering price of $27.04 per share, including 600,000 shares issued upon exercise by the underwriters of their option to purchase additional shares. The Company received net proceeds of approximately $117.9 million after deducting underwriting discounts and commissions and other offering expenses payable by the Company. In January 2019, the Company closed an underwritten public offering of its common stock. The Company issued and sold an aggregate of 7,563,725 shares of common stock at a public offering price of $30.20 per share, including 843,725 shares issued upon exercise by the underwriter of its option to purchase additional shares in February 2019. The Company received net proceeds of $224.2 million after deducting underwriting discounts and commissions and other offering expenses payable by the Company. In August 2019, the Company entered into an At the Market Offering Sales Agreement (the “Sales Agreement”) with Cantor Fitzgerald and RBC Capital Markets, LLC (together, the “Sales Agents”), pursuant to which, the Company may offer and sell shares of its common stock, having an aggregate offering price of up to $125.0 million from time to time through the Sales Agents by any method that is deemed to be an “at the market offering” as defined in Rule 415(a)(4) promulgated under the Securities Act of 1933, as amended. During the twelve month period ending December 31, 2019, the Company issued and sold an aggregate of 63,926 shares of common stock pursuant to the Sales Agreement at a weighted average public offering price of $46.60 per share. The Company received net proceeds of $2.6 million after deducting agent discounts and commissions and other offering expenses payable by the Company. In September 2019, the Company closed an underwritten public offering of its common stock. The Company issued and sold an aggregate of 2,475,248 shares of common stock at a public offering price of $40.40 per share. The offering included an option to purchase up to an additional 371,287 shares for a period of 30 days following the offering. This option was not exercised by the underwriter. The Company received net proceeds of $97.0 million after deducting underwriting discounts and commissions and other offering expenses payable by the Company. During the twelve month period ending December 31, 2020, the Company issued and sold an aggregate of 542,470 shares of common stock pursuant to the Sales Agreement at a weighted average public offering price of $53.37 per share. The Company received net proceeds of $28.1 million after deducting agent discounts and commissions and other offering expenses payable by the Company. The remaining shares of the Company’s common stock available to be issued and sold, under the Sales Agreement, have an aggregate offering price of up to $93.0 million as of December 31, 2020. As a result of the Rights Exchange Agreement, during the twelve month period ended December 31, 2020, the Company issued 2,821,176 shares of its common stock to Participating Rightholders. The shares had a fair value of $150.5 million upon issuance. As a result of the Censa Merger, during the twelve month period ended December 31, 2020, the Company issued 845,364 shares of the Company’s common stock to Censa securityholders, which were valued at $42.9 million based on the closing stock price on the acquisition date. The number of shares issued was determined using a 30-day VWAP pursuant to the Censa Merger Agreement. ​ As of December 31, 2020, the Company’s number of authorized shares of common stock was 125,000,000. ​

X
- References No definition available. + Details
Name: | us-gaap_StockholdersEquityNoteAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
Name: | us-gaap_StockholdersEquityNoteDisclosureTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration