Redeemable Convertible Preferred Stock and Common Stock - Narrative (Details)
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1 Months Ended |
12 Months Ended |
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Dec. 11, 2018
USD ($)
$ / shares
shares
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Aug. 10, 2016
USD ($)
$ / shares
shares
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Sep. 30, 2018
USD ($)
shares
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May 31, 2018
USD ($)
$ / shares
shares
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Feb. 28, 2018
USD ($)
$ / shares
shares
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Feb. 15, 2018
USD ($)
$ / shares
shares
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Dec. 31, 2019
USD ($)
$ / shares
shares
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Dec. 31, 2018
USD ($)
$ / shares
shares
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Dec. 31, 2017
USD ($)
shares
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May 07, 2018
shares
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| Subsidiary, Sale of Stock [Line Items] |
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| Common stock, shares authorized (in shares) |
1,600,000,000
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775,000,000
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1,600,000,000
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1,600,000,000
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| Redeemable convertible preferred stock, shares authorized |
509,352,795
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448,686,791
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509,352,795
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| Common stock, par value (usd per share) | $ / shares |
$ 0.0001
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$ 0.0001
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$ 0.0001
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| Preferred stock, shares authorized (in shares) |
162,000,000
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162,000,000
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162,000,000
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| Preferred stock, par value (usd per share) | $ / shares |
$ 0.0001
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$ 0.0001
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$ 0.0001
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| Proceeds from initial public offering of common stock, net of issuance costs | $ |
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$ 0
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$ 563,026,000
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$ 0
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| Offering expenses | $ |
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$ 41,322,000
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| Redeemable convertible preferred stock, shares issued |
508,539,515
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0
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0
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448,686,791
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| Redeemable convertible preferred stock, shares outstanding |
508,539,515
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0
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0
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448,686,791
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| Accretion of redeemable convertible preferred units | $ |
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$ 0
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| Series F Redeemable Convertible Preferred Stock |
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| Subsidiary, Sale of Stock [Line Items] |
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| Redeemable convertible preferred stock, shares authorized |
54,001,241
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54,001,241
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| Shares of common stock issued (in shares) |
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54,001,241
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| Price per share (usd per share) | $ / shares |
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$ 8.78
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| Aggregate net proceeds from the offering | $ |
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$ 474,100,000
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| Offering expenses | $ |
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$ 600,000
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| Redeemable convertible preferred stock, shares issued |
54,001,241
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54,001,241
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| Redeemable convertible preferred stock, shares outstanding |
54,001,241
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54,001,241
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| Authorized number of shares (in shares) |
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68,337,129
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| Conversion price (usd per share) | $ / shares |
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$ 19.14
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| Series G Redeemable Convertible Preferred Stock |
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| Subsidiary, Sale of Stock [Line Items] |
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| Redeemable convertible preferred stock, shares authorized |
55,666,004
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| Shares of common stock issued (in shares) |
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55,666,004
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55,666,004
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| Price per share (usd per share) | $ / shares |
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$ 10.06
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$ 10.06
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| Aggregate net proceeds from the offering | $ |
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$ 560,000,000
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$ 560,000,000
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| Offering expenses | $ |
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$ 10,500,000
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$ 10,517,000
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$ 10,517,000
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| Redeemable convertible preferred stock, shares issued |
55,666,004
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| Redeemable convertible preferred stock, shares outstanding |
55,666,004
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| Conversion price (usd per share) | $ / shares |
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$ 21.93
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| Series H Redeemable Convertible Preferred Stock |
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| Subsidiary, Sale of Stock [Line Items] |
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| Redeemable convertible preferred stock, shares authorized |
5,000,000
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| Shares of common stock issued (in shares) |
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5,000,000
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| Price per share (usd per share) | $ / shares |
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$ 25.00
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| Aggregate net proceeds from the offering | $ |
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$ 112,000,000
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| Offering expenses | $ |
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$ 400,000
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$ 474,000
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$ 474,000
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| Redeemable convertible preferred stock, shares issued |
5,000,000
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| Redeemable convertible preferred stock, shares outstanding |
5,000,000
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| Conversion ratio |
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0.8771930
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| Conversion price (usd per share) | $ / shares |
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$ 21.93
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$ 21.93
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| Fair value per share (usd per share) | $ / shares |
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$ 22.39
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| Premium recorded to deferred revenue | $ |
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$ 13,000,000
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| Convertible holding period |
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21 months
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| Percentage discount on shares |
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10.00%
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| Series D Redeemable Convertible Preferred Stock |
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| Subsidiary, Sale of Stock [Line Items] |
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| Redeemable convertible preferred stock, shares authorized |
63,291,156
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63,291,156
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| Redeemable convertible preferred stock, shares issued |
63,021,976
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63,291,156
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| Redeemable convertible preferred stock, shares outstanding |
63,021,976
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63,291,156
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| Conversion price (usd per share) | $ / shares |
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$ 4.65
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| Repurchase of redeemable convertible preferred stock (in shares) |
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269,180
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| Repurchase of redeemable convertible preferred stock | $ |
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$ 2,009,000
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| Dividend rate per annum (usd per share | $ / shares |
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$ 0.171
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| Series E Redeemable Convertible Preferred Stock |
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| Subsidiary, Sale of Stock [Line Items] |
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| Redeemable convertible preferred stock, shares authorized |
81,428,340
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81,428,340
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| Redeemable convertible preferred stock, shares issued |
80,884,240
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81,428,340
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| Redeemable convertible preferred stock, shares outstanding |
80,884,240
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81,428,340
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| Conversion price (usd per share) | $ / shares |
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$ 13.45
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| Repurchase of redeemable convertible preferred stock (in shares) |
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544,100
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| Repurchase of redeemable convertible preferred stock | $ |
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$ 8,200,000
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$ 2,118,000
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| Series A Redeemable Convertible Preferred Stock |
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| Subsidiary, Sale of Stock [Line Items] |
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| Redeemable convertible preferred stock, shares authorized |
42,000,000
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42,000,000
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| Redeemable convertible preferred stock, shares issued |
42,000,000
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42,000,000
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| Redeemable convertible preferred stock, shares outstanding |
42,000,000
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42,000,000
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| Conversion price (usd per share) | $ / shares |
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$ 0.11
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| Dividend rate per annum (usd per share | $ / shares |
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0.004
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| Series B Redeemable Convertible Preferred Stock |
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| Subsidiary, Sale of Stock [Line Items] |
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| Redeemable convertible preferred stock, shares authorized |
122,296,280
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122,296,280
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| Redeemable convertible preferred stock, shares issued |
122,296,280
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122,296,280
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| Redeemable convertible preferred stock, shares outstanding |
122,296,280
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122,296,280
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| Conversion price (usd per share) | $ / shares |
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0.17
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| Dividend rate per annum (usd per share | $ / shares |
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0.006
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| Series C Redeemable Convertible Preferred Stock |
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| Subsidiary, Sale of Stock [Line Items] |
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| Redeemable convertible preferred stock, shares authorized |
85,669,774
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85,669,774
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| Redeemable convertible preferred stock, shares issued |
85,669,774
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85,669,774
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| Redeemable convertible preferred stock, shares outstanding |
85,669,774
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85,669,774
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| Conversion price (usd per share) | $ / shares |
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0.70
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| Dividend rate per annum (usd per share | $ / shares |
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$ 0.02568
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| IPO |
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| Subsidiary, Sale of Stock [Line Items] |
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| Shares of common stock issued (in shares) |
26,275,993
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| Price per share (usd per share) | $ / shares |
$ 23.00
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| Aggregate net proceeds from the offering | $ |
$ 563,000,000
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| Underwriting discounts | $ |
33,200,000
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| Offering expenses | $ |
$ 8,100,000
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| IPO | Common Stock |
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| Subsidiary, Sale of Stock [Line Items] |
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| Preferred stock converted into common stock (in shares) |
236,012,913
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